AWK: Difference between revisions
m →Built-in variables: Removed the single quotes around the letters forming the names of the variables in their full name. They were unnecessary to understand why the variables were named the way they were, and made reading difficult. The only one which may justify this clarification is OFMT, but even this is clear enough. After trying underlining or boldening said letters, I reverted to no formatting. |
It's appropriate to spell it either all uppercase AWK, or all lowercase awk, but never appropriate to spell it sentence case Awk, since the 3 letters represent the initials of its 3 founding fathers, similar to how one can spell it RSA or rsa but never Rsa. |
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{{ |
{{Short description|Programming language}} |
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{{About|the programming language}} |
{{About|the programming language}} |
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{{Infobox programming language |
{{Infobox programming language |
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| logo = The-AWK-Programming-Language.svg |
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| logo = |
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| screenshot = Awk-example-usage-gimp.gif |
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| screenshot_caption = Usage of AWK in shell to check matching fields in two files |
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| name = AWK |
| name = AWK |
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| paradigm = [[scripting language|Scripting]], [[procedural programming|procedural]], [[data-driven programming|data-driven]]<ref name=developerworks>{{cite web|url=https://www6.software.ibm.com/developerworks/education/au-gawk/au-gawk-a4.pdf|title=Get started with GAWK: AWK language fundamentals|last=Stutz|first=Michael|date=September 19, 2006|work=developerWorks|publisher=[[IBM]]|access-date=2015-01-29|quote=[AWK is] often called a data-driven language -- the program statements describe the input data to match and process rather than a sequence of program steps}}</ref> |
| paradigm = [[scripting language|Scripting]], [[procedural programming|procedural]], [[data-driven programming|data-driven]]<ref name=developerworks>{{cite web|url=https://www6.software.ibm.com/developerworks/education/au-gawk/au-gawk-a4.pdf|title=Get started with GAWK: AWK language fundamentals|last=Stutz|first=Michael|date=September 19, 2006|work=developerWorks|publisher=[[IBM]]|access-date=2015-01-29|quote=[AWK is] often called a data-driven language -- the program statements describe the input data to match and process rather than a sequence of program steps|archive-date=2015-04-27|archive-url=https://web.archive.org/web/20150427143548/https://www6.software.ibm.com/developerworks/education/au-gawk/au-gawk-a4.pdf|url-status=live}}</ref> |
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| year = {{start date and age|1977}} |
| year = {{start date and age|1977}} |
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| latest_release_version = [http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html IEEE Std 1003.1-2008] (POSIX) / 1985 |
| latest_release_version = [http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html IEEE Std 1003.1-2008] (POSIX) / 1985 |
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'''AWK''' ( |
'''AWK''' ({{IPAc-en|ɔː|k}}<ref name=awkLC.DR/>) is a [[domain-specific language]] designed for text processing and typically used as a [[data extraction]] and reporting tool. Like [[sed]] and [[grep]], it is a [[filter (software)|filter]],<ref name=awkLC.DR>{{cite magazine |magazine=Digital Review |date=May 2, 1988 |page=91 |author=James W. Livingston |title=The Great awk Program is No Birdbrain}}</ref> and it is a standard feature of most [[Unix-like|Unix-like operating systems]]. |
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The AWK language is a [[data-driven programming|data-driven]] [[scripting language]] consisting of a set of actions to be taken against [[Stream (computing)|streams]] of textual data – either run directly on files or used as part of a [[pipeline (Unix)|pipeline]] – for purposes of extracting or transforming text, such as producing formatted reports. The language extensively uses the [[string (computer science)|string]] [[datatype]], [[associative array]]s (that is, arrays indexed by key strings), and [[regular expression]]s. While AWK has a limited intended [[Domain (software engineering)|application domain]] and was especially designed to support [[one-liner program]]s, the language is [[Turing-complete]], and even the early Bell Labs users of AWK often wrote well-structured large AWK programs.<ref>{{cite web |
The AWK language is a [[data-driven programming|data-driven]] [[scripting language]] consisting of a set of actions to be taken against [[Stream (computing)|streams]] of textual data – either run directly on files or used as part of a [[pipeline (Unix)|pipeline]] – for purposes of extracting or transforming text, such as producing formatted reports. The language extensively uses the [[string (computer science)|string]] [[datatype]], [[associative array]]s (that is, arrays indexed by key strings), and [[regular expression]]s. While AWK has a limited intended [[Domain (software engineering)|application domain]] and was especially designed to support [[one-liner program]]s, the language is [[Turing-complete]], and even the early Bell Labs users of AWK often wrote well-structured large AWK programs.<ref>{{cite web |
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}}</ref> |
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AWK was created at [[Bell Labs]] in the 1970s,<ref>{{cite |
AWK was created at [[Bell Labs]] in the 1970s,<ref>{{cite tech report |url=https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.31.1299 |title=Awk — A Pattern Scanning and Processing Language (Second Edition) |last1=Aho |first1=Alfred V. |author-link1=Alfred Aho |last2=Kernighan |first2=Brian W. |author-link2=Brian Kernighan |last3=Weinberger |first3=Peter J. |author-link3=Peter J. Weinberger |date=September 1, 1978 |publisher=Bell Telephone Laboratories, Inc. |series=Unix Seventh Edition Manual, Volume 2 |access-date=February 1, 2020}}</ref> and its name is derived from the surnames of its authors: [[Alfred Aho]] (author of [[egrep]]), [[Peter J. Weinberger|Peter Weinberger]] (who worked on tiny relational databases), and [[Brian Kernighan]]. The acronym is pronounced the same as the name of the bird species [[auk]], which is illustrated on the cover of ''[[The AWK Programming Language]]''.<ref name="AWK1" /> When written in all lowercase letters, as <code>awk</code>, it refers to the [[Unix]] or [[Plan 9 from Bell Labs|Plan 9]] program that runs scripts written in the AWK programming language. |
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==History== |
==History== |
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⚫ | According to Brian Kernighan, one of the goals of AWK was to have a tool that would easily manipulate both numbers and strings. AWK was also inspired by [[Marc Rochkind]]'s programming language that was used to search for patterns in input data, and was implemented using [[yacc]].<ref>{{cite web|url=https://www.youtube.com/watch?v=vT_J6xc-Az0 | archive-url=https://ghostarchive.org/varchive/youtube/20211122/vT_J6xc-Az0| archive-date=2021-11-22 | url-status=live|title=UNIX Special: Profs Kernighan & Brailsford |work=Computerphile |date=September 30, 2015 }}{{cbignore}}</ref> |
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AWK was initially developed in 1977 by [[Alfred Aho]] (author of [[egrep]]), [[Peter J. Weinberger]] (who worked on tiny relational databases), and [[Brian Kernighan]]; it takes its name from their respective initials. According to Kernighan, one of the goals of AWK was to have a tool that would easily manipulate both numbers and strings. |
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⚫ | AWK was also inspired by [[Marc Rochkind]]'s programming language that was used to search for patterns in input data, and was implemented using [[yacc]].<ref>{{cite web|url=https://www.youtube.com/watch?v=vT_J6xc-Az0 |title=UNIX Special: Profs Kernighan & Brailsford |work=Computerphile |date=September 30, 2015 }}</ref> |
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As one of the early tools to appear in [[Version 7 Unix]], AWK added computational features to a Unix [[pipeline (Unix)|pipeline]] besides the [[Bourne shell]], the only scripting language available in a standard Unix environment. It is one of the mandatory utilities of the [[Single UNIX Specification]],<ref>{{Cite web |url=http://www.unix.org/version3/apis/cu.html |title=The Single UNIX Specification, Version 3, Utilities Interface Table |access-date=2005-12-18 |archive-url=https://web.archive.org/web/20180105030249/http://www.unix.org/version3/apis/cu.html |archive-date=2018-01-05 |url-status=dead }}</ref> and is required by the [[Linux Standard Base]] specification.<ref>{{cite |
As one of the early tools to appear in [[Version 7 Unix]], AWK added computational features to a Unix [[pipeline (Unix)|pipeline]] besides the [[Bourne shell]], the only scripting language available in a standard Unix environment. It is one of the mandatory utilities of the [[Single UNIX Specification]],<ref>{{Cite web |url=http://www.unix.org/version3/apis/cu.html |title=The Single UNIX Specification, Version 3, Utilities Interface Table |access-date=2005-12-18 |archive-url=https://web.archive.org/web/20180105030249/http://www.unix.org/version3/apis/cu.html |archive-date=2018-01-05 |url-status=dead }}</ref> and is required by the [[Linux Standard Base]] specification.<ref>{{cite tech report |url=https://refspecs.linuxfoundation.org/LSB_4.0.0/LSB-Core-generic/LSB-Core-generic.html#COMMAND |title=Linux Standard Base Core Specification 4.0 |chapter=Chapter 15. Commands and Utilities |institution=Linux Foundation |date=2008 |access-date=2020-02-01 |archive-date=2019-10-16 |archive-url=https://web.archive.org/web/20191016015828/https://refspecs.linuxfoundation.org/LSB_4.0.0/LSB-Core-generic/LSB-Core-generic.html#COMMAND |url-status=live }}</ref> |
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In 1983, AWK was one of several UNIX tools available for Charles River Data Systems' [[UNOS (operating system)|UNOS]] operating system under [[Bell Laboratories]] license.<ref>{{Cite book|year=1983|title=The Insider's Guide To The Universe|publisher=Charles River Data Systems, Inc.|url=https://www.1000bit.it/ad/bro/charles/CharlesRiverSystem-Universe.pdf|page=13}}</ref> |
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⚫ | AWK was significantly revised and expanded in 1985–88, resulting in the [[Gawk (GNU package)|GNU AWK]] implementation written by |
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⚫ | AWK was significantly revised and expanded in 1985–88, resulting in the [[Gawk (GNU package)|GNU AWK]] implementation written by Paul Rubin, [[Jay Fenlason]], and [[Richard Stallman]], released in 1988.<ref name=robbins/> GNU AWK may be the most widely deployed version<ref>{{cite book|last1=Dougherty|first1=Dale|last2=Robbins|first2=Arnold|title=sed & awk|date=1997|publisher=O'Reilly|location=Sebastopol, CA|isbn=1-565-92225-5|page=221|edition=2nd}}</ref> because it is included with GNU-based Linux packages. GNU AWK has been maintained solely by [[Arnold Robbins]] since 1994.<ref name=robbins>{{cite web |url=http://www.skeeve.com/gnu-awk-and-me-2014.pdf |title=The GNU Project and Me: 27 Years with GNU AWK |website=skeeve.com |first=Arnold |last=Robbins |date=March 2014 |access-date=October 4, 2014 |archive-date=October 6, 2014 |archive-url=https://web.archive.org/web/20141006081656/http://www.skeeve.com/gnu-awk-and-me-2014.pdf |url-status=live }}</ref> [[Brian Kernighan]]'s [[nawk]] (New AWK) source was first released in 1993 unpublicized, and publicly since the late 1990s; many BSD systems use it to avoid the GPL license.<ref name=robbins/> |
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AWK was preceded by [[sed]] (1974). Both were designed for text processing. They share the line-oriented, data-driven paradigm, and are particularly suited to writing [[one-liner program]]s, due to the implicit [[main loop]] and current line variables. The power and terseness of early AWK programs – notably the powerful regular expression handling and conciseness due to implicit variables, which facilitate one-liners – together with the limitations of AWK at the time, were important inspirations for the [[Perl]] language (1987). In the 1990s, Perl became very popular, competing with AWK in the niche of Unix text-processing languages. |
AWK was preceded by [[sed]] (1974). Both were designed for text processing. They share the line-oriented, data-driven paradigm, and are particularly suited to writing [[one-liner program]]s, due to the implicit [[main loop]] and current line variables. The power and terseness of early AWK programs – notably the powerful regular expression handling and conciseness due to implicit variables, which facilitate one-liners – together with the limitations of AWK at the time, were important inspirations for the [[Perl]] language (1987). In the 1990s, Perl became very popular, competing with AWK in the niche of Unix text-processing languages. |
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== Structure of AWK programs == |
== Structure of AWK programs == |
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[[File:POSIX awk.pdf|thumb]] |
[[File:POSIX awk.pdf|thumb]] |
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{{ |
{{Blockquote|AWK reads the input a line at a time. A line is scanned for each pattern in the program, and for each pattern that matches, the associated action is executed.|author= Alfred V. Aho<ref>{{cite web |first=Naomi |last=Hamilton |url=https://www.computerworld.com/article/2535126/the-a-z-of-programming-languages--awk.html |title=The A-Z of Programming Languages: AWK |date=May 30, 2008 |work=[[Computerworld]] |access-date=2008-12-12 |archive-date=2020-02-01 |archive-url=https://web.archive.org/web/20200201095859/https://www.computerworld.com/article/2535126/the-a-z-of-programming-languages--awk.html |url-status=live }}</ref>}} |
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An AWK program is a series of pattern action pairs, written as: |
An AWK program is a series of pattern action pairs, written as: |
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where ''condition'' is typically an expression and ''action'' is a series of commands. The input is split into records, where by default records are separated by newline characters so that the input is split into lines. The program tests each record against each of the conditions in turn, and executes the ''action'' for each expression that is true. Either the condition or the action may be omitted. The condition defaults to matching every record. The default action is to print the record. This is the same pattern-action structure as sed. |
where ''condition'' is typically an expression and ''action'' is a series of commands. The input is split into records, where by default records are separated by newline characters so that the input is split into lines. The program tests each record against each of the conditions in turn, and executes the ''action'' for each expression that is true. Either the condition or the action may be omitted. The condition defaults to matching every record. The default action is to print the record. This is the same pattern-action structure as sed. |
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In addition to a simple AWK expression, such as <code>foo == 1</code> or <code>/^foo/</code>, the condition can be <code>BEGIN</code> or <code>END</code> causing the action to be executed before or after all records have been read, or ''pattern1, pattern2'' which matches the range of records starting with a record that matches ''pattern1'' up to and including the record that matches ''pattern2'' before again trying to match against ''pattern1'' on |
In addition to a simple AWK expression, such as <code>foo == 1</code> or <code>/^foo/</code>, the condition can be <code>BEGIN</code> or <code>END</code> causing the action to be executed before or after all records have been read, or ''pattern1, pattern2'' which matches the range of records starting with a record that matches ''pattern1'' up to and including the record that matches ''pattern2'' before again trying to match against ''pattern1'' on subsequent lines. |
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In addition to normal arithmetic and logical operators, AWK expressions include the tilde operator, <code>~</code>, which matches a [[regular expression]] against a string. As handy [[syntactic sugar]], ''/regexp/'' without using the tilde operator matches against the current record; this syntax derives from [[sed]], which in turn inherited it from the [[Ed (text editor)|ed]] editor, where <code>/</code> is used for searching. This syntax of using slashes as [[delimiter]]s for regular expressions was subsequently adopted by [[Perl]] and [[ECMAScript]], and is now common. The tilde operator was also adopted by Perl. |
In addition to normal arithmetic and logical operators, AWK expressions include the tilde operator, <code>~</code>, which matches a [[regular expression]] against a string. As handy [[syntactic sugar]], ''/regexp/'' without using the tilde operator matches against the current record; this syntax derives from [[sed]], which in turn inherited it from the [[Ed (text editor)|ed]] editor, where <code>/</code> is used for searching. This syntax of using slashes as [[delimiter]]s for regular expressions was subsequently adopted by [[Perl]] and [[ECMAScript]], and is now common. The tilde operator was also adopted by Perl. |
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: Displays the first and third fields of the current record, separated by a predefined string called the output field separator (OFS) whose default value is a single space character |
: Displays the first and third fields of the current record, separated by a predefined string called the output field separator (OFS) whose default value is a single space character |
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Although these fields (''$X'') may bear resemblance to variables (the $ symbol indicates variables in [[Perl]]), they actually refer to the fields of the current record. A special case, ''$0'', refers to the entire record. In fact, the commands "<code>print</code>" and "<code>print $0</code>" are identical in functionality. |
Although these fields (''$X'') may bear resemblance to variables (the $ symbol indicates variables in the usual Unix shells and in [[Perl]]), they actually refer to the fields of the current record. A special case, ''$0'', refers to the entire record. In fact, the commands "<code>print</code>" and "<code>print $0</code>" are identical in functionality. |
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The ''print'' command can also display the results of calculations and/or function calls: |
The ''print'' command can also display the results of calculations and/or function calls: |
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=== Built-in variables === |
=== Built-in variables === |
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AWK's built-in variables include the field variables: $1, $2, $3, and so on ($0 represents the entire record). They hold the text or values in the individual text-fields in a record. |
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Other variables include: |
Other variables include: |
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* <code>NR</code>: Number of Records |
* <code>NR</code>: Number of Records. Keeps a current count of the number of input records read so far from all data files. It starts at zero, but is never automatically reset to zero.<ref name="GNU.org Records">{{Cite web|url=https://www.gnu.org/software/gawk/manual/html_node/Records.html#index-FNR-variable|title=Records (The GNU AWK User's Guide)|access-date=2020-05-23|archive-date=2020-06-14|archive-url=https://web.archive.org/web/20200614234208/https://www.gnu.org/software/gawk/manual/html_node/Records.html#index-FNR-variable|url-status=live}}</ref> |
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* <code>FNR</code>: File Number of Records |
* <code>FNR</code>: File Number of Records. Keeps a current count of the number of input records read so far ''in the current file.'' This variable is automatically reset to zero each time a new file is started.<ref name="GNU.org Records" /> |
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* <code>NF</code>: Number of Fields |
* <code>NF</code>: Number of Fields. Contains the number of fields in the current input record. The last field in the input record can be designated by $NF, the 2nd-to-last field by $(NF-1), the 3rd-to-last field by $(NF-2), etc. |
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* <code>FILENAME</code>: Contains the name of the current input-file. |
* <code>FILENAME</code>: Contains the name of the current input-file. |
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* <code>FS</code>: Field Separator |
* <code>FS</code>: Field Separator. Contains the "field separator" used to divide fields in the input record. The default, "white space", allows any sequence of space and tab characters. FS can be reassigned with another character or character sequence to change the field separator. |
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* <code>RS</code>: Record Separator |
* <code>RS</code>: Record Separator. Stores the current "record separator" character. Since, by default, an input line is the input record, the default record separator character is a "newline". |
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* <code>OFS</code>: Output Field Separator |
* <code>OFS</code>: Output Field Separator. Stores the "output field separator", which separates the fields when awk prints them. The default is a "space" character. |
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* <code>ORS</code>: Output Record Separator |
* <code>ORS</code>: Output Record Separator. Stores the "output record separator", which separates the output records when awk prints them. The default is a "newline" character. |
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* <code>OFMT</code>: Output Format |
* <code>OFMT</code>: Output Format. Stores the format for numeric output. The default format is "%.6g". |
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=== Variables and syntax === |
=== Variables and syntax === |
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Variable names can use any of the characters [A-Za-z0-9_], with the exception of language keywords. The operators ''+ - * /'' represent addition, subtraction, multiplication, and division, respectively. For string [[concatenation]], simply place two variables (or string constants) next to each other. It is optional to use a space in between if string constants are involved, but two variable names placed adjacent to each other require a space in between. Double quotes [[delimit]] string constants. Statements need not end with semicolons. Finally, comments can be added to programs by using ''#'' as the first character on a line. |
Variable names can use any of the characters [A-Za-z0-9_], with the exception of language keywords, and cannot begin with a numeric digit. The operators ''+ - * /'' represent addition, subtraction, multiplication, and division, respectively. For string [[concatenation]], simply place two variables (or string constants) next to each other. It is optional to use a space in between if string constants are involved, but two variable names placed adjacent to each other require a space in between. Double quotes [[delimit]] string constants. Statements need not end with semicolons. Finally, comments can be added to programs by using ''#'' as the first character on a line, or behind a command or sequence of commands. |
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=== User-defined functions === |
=== User-defined functions === |
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In a format similar to [[C (programming language)|C]], function definitions consist of the keyword <code>function</code>, the function name, argument names and the function body. Here is an example of a function. |
In a format similar to [[C (programming language)|C]], function definitions consist of the keyword <code>function</code>, the function name, argument names and the function body. Here is an example of a function. |
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<syntaxhighlight lang="awk"> |
<syntaxhighlight lang="awk"> |
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function add_three |
function add_three(number) { |
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return number + 3 |
return number + 3 |
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} |
} |
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This statement can be invoked as follows: |
This statement can be invoked as follows: |
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<syntaxhighlight lang="awk"> |
<syntaxhighlight lang="awk"> |
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(pattern) |
(pattern) { |
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{ |
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print add_three(36) # Outputs '''39''' |
print add_three(36) # Outputs '''39''' |
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} |
} |
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== Examples == |
== Examples == |
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=== Hello World === |
=== Hello, World! === |
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Here is the customary |
Here is the customary [["Hello, World!" program]] written in AWK: |
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<syntaxhighlight lang="awk"> |
<syntaxhighlight lang="awk"> |
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BEGIN { print "Hello, world!" |
BEGIN { |
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print "Hello, world!" |
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exit |
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} |
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</syntaxhighlight> |
</syntaxhighlight> |
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Note that an explicit <code>exit</code> statement is not needed here; since the only pattern is <code>BEGIN</code>, no command-line arguments are processed. |
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=== Print lines longer than 80 characters === |
=== Print lines longer than 80 characters === |
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Print all lines longer than 80 characters. |
Print all lines longer than 80 characters. The default action is to print the current line. |
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<syntaxhighlight lang="awk"> |
<syntaxhighlight lang="awk"> |
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length($0) > 80 |
length($0) > 80 |
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</syntaxhighlight> |
</syntaxhighlight> |
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As there is no pattern for the first line of the program, every line of input matches by default, so the increment actions are executed for every line. |
As there is no pattern for the first line of the program, every line of input matches by default, so the increment actions are executed for every line. <code>words += NF</code> is shorthand for <code>words = words + NF</code>. |
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=== Sum last word === |
=== Sum last word === |
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''s'' is incremented by the numeric value of ''$NF'', which is the last word on the line as defined by AWK's field separator (by default, white-space). ''NF'' is the number of fields in the current line, e.g. 4. Since ''$4'' is the value of the fourth field, ''$NF'' is the value of the last field in the line regardless of how many fields this line has, or whether it has more or fewer fields than surrounding lines. $ is actually a unary operator with the highest [[operator precedence]]. (If the line has no fields, then ''NF'' is 0, ''$0'' is the whole line, which in this case is empty apart from possible white-space, and so has the numeric value 0.) |
''s'' is incremented by the numeric value of ''$NF'', which is the last word on the line as defined by AWK's field separator (by default, white-space). ''NF'' is the number of fields in the current line, e.g. 4. Since ''$4'' is the value of the fourth field, ''$NF'' is the value of the last field in the line regardless of how many fields this line has, or whether it has more or fewer fields than surrounding lines. $ is actually a unary operator with the highest [[operator precedence]]. (If the line has no fields, then ''NF'' is 0, ''$0'' is the whole line, which in this case is empty apart from possible white-space, and so has the numeric value 0.) |
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At the end of the input the ''END'' pattern matches, so ''s'' is printed. However, since there may have been no lines of input at all, in which case no value has ever been assigned to ''s'', it will by default be an empty string. Adding zero to a variable is an AWK idiom for coercing it from a string to a numeric value. (Concatenating an empty string is to coerce from a number to a string, e.g. ''s ""''. Note, there's no operator to concatenate strings, they're just placed adjacently.) With the coercion the program prints "0" on an empty input, without it an empty line is printed. |
At the end of the input the ''END'' pattern matches, so ''s'' is printed. However, since there may have been no lines of input at all, in which case no value has ever been assigned to ''s'', it will by default be an empty string. Adding zero to a variable is an AWK idiom for coercing it from a string to a numeric value. (Concatenating an empty string is to coerce from a number to a string, e.g. ''s ""''. Note, there's no operator to concatenate strings, they're just placed adjacently.) With the coercion the program prints "0" on an empty input, without it, an empty line is printed. |
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=== Match a range of input lines === |
=== Match a range of input lines === |
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</syntaxhighlight> |
</syntaxhighlight> |
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The BEGIN block sets the field separator to any sequence of non-alphabetic characters. |
The BEGIN block sets the field separator to any sequence of non-alphabetic characters. Separators can be regular expressions. After that, we get to a bare action, which performs the action on every input line. In this case, for every field on the line, we add one to the number of times that word, first converted to lowercase, appears. Finally, in the END block, we print the words with their frequencies. The line |
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for (i in words) |
for (i in words) |
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creates a loop that goes through the array ''words'', setting ''i'' to each ''subscript'' of the array. This is different from most languages, where such a loop goes through each ''value'' in the array. The loop thus prints out each word followed by its frequency count. <code>tolower</code> was an addition to the One True awk (see below) made after the book was published. |
creates a loop that goes through the array ''words'', setting ''i'' to each ''subscript'' of the array. This is different from most languages, where such a loop goes through each ''value'' in the array. The loop thus prints out each word followed by its frequency count. <code>tolower</code> was an addition to the One True awk (see below) made after the book was published. |
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This is a shell script that uses <code>ENVIRON</code>, an array introduced in a newer version of the One True awk after the book was published. The subscript of <code>ENVIRON</code> is the name of an environment variable; its result is the variable's value. This is like the [[getenv]] function in various standard libraries and [[POSIX]]. The shell script makes an environment variable <code>pattern</code> containing the first argument, then drops that argument and has awk look for the pattern in each file. |
This is a shell script that uses <code>ENVIRON</code>, an array introduced in a newer version of the One True awk after the book was published. The subscript of <code>ENVIRON</code> is the name of an environment variable; its result is the variable's value. This is like the [[getenv]] function in various standard libraries and [[POSIX]]. The shell script makes an environment variable <code>pattern</code> containing the first argument, then drops that argument and has awk look for the pattern in each file. |
||
<code>~</code> checks to see if its left operand matches its right operand; <code>!~</code> is its inverse. |
<code>~</code> checks to see if its left operand matches its right operand; <code>!~</code> is its inverse. A regular expression is just a string and can be stored in variables. |
||
The next way uses command-line variable assignment, in which an argument to awk can be seen as an assignment to a variable: |
The next way uses command-line variable assignment, in which an argument to awk can be seen as an assignment to a variable: |
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Line 268: | Line 271: | ||
pattern="$1" |
pattern="$1" |
||
shift |
shift |
||
awk '$0 ~ pattern { print FILENAME ":" $0 }' |
awk '$0 ~ pattern { print FILENAME ":" $0 }' pattern="$pattern" "$@" |
||
</syntaxhighlight> |
</syntaxhighlight> |
||
Line 288: | Line 291: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
The <code>BEGIN</code> is necessary not only to extract the first argument, but also to prevent it from being interpreted as a filename after the <code>BEGIN</code> block ends. <code>ARGC</code>, the number of arguments, is always guaranteed to be ≥1, as <code>ARGV[0]</code> is the name of the command that executed the script, most often the string <code>"awk"</code>. |
The <code>BEGIN</code> is necessary not only to extract the first argument, but also to prevent it from being interpreted as a filename after the <code>BEGIN</code> block ends. <code>ARGC</code>, the number of arguments, is always guaranteed to be ≥1, as <code>ARGV[0]</code> is the name of the command that executed the script, most often the string <code>"awk"</code>. <code>ARGV[ARGC]</code> is the empty string, <code>""</code>. <code>#</code> initiates a comment that expands to the end of the line. |
||
Note the <code>if</code> block. awk only checks to see if it should read from standard input before it runs the command. This means that |
Note the <code>if</code> block. awk only checks to see if it should read from standard input before it runs the command. This means that |
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On Unix-like operating systems self-contained AWK scripts can be constructed using the [[shebang (Unix)|shebang]] syntax. |
On Unix-like operating systems self-contained AWK scripts can be constructed using the [[shebang (Unix)|shebang]] syntax. |
||
For example, a script that |
For example, a script that sends the content of a given file to standard output may be built by creating a file named <code>print.awk</code> with the following content: |
||
<syntaxhighlight lang="awk"> |
<syntaxhighlight lang="awk"> |
||
#!/usr/bin/awk -f |
#!/usr/bin/awk -f |
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It can be invoked with: <code>./print.awk <filename></code> |
It can be invoked with: <code>./print.awk <filename></code> |
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The <code>-f</code> tells |
The <code>-f</code> tells awk that the argument that follows is the file to read the AWK program from, which is the same flag that is used in sed. Since they are often used for one-liners, both these programs default to executing a program given as a command-line argument, rather than a separate file. |
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== Versions and implementations == |
== Versions and implementations == |
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In 1985 its authors started expanding the language, most significantly by adding user-defined functions. The language is described in the book ''[[The AWK Programming Language]]'', published 1988, and its implementation was made available in releases of [[UNIX System V]]. To avoid confusion with the incompatible older version, this version was sometimes called "new awk" or ''nawk''. This implementation was released under a [[free software license]] in 1996 and is still maintained by Brian Kernighan (see external links below).{{citation needed|date=February 2020}} |
In 1985 its authors started expanding the language, most significantly by adding user-defined functions. The language is described in the book ''[[The AWK Programming Language]]'', published 1988, and its implementation was made available in releases of [[UNIX System V]]. To avoid confusion with the incompatible older version, this version was sometimes called "new awk" or ''nawk''. This implementation was released under a [[free software license]] in 1996 and is still maintained by Brian Kernighan (see external links below).{{citation needed|date=February 2020}} |
||
Old versions of Unix, such as [[UNIX/32V]], included <code>awkcc</code>, which converted AWK to C. Kernighan wrote a program to turn awk into C++; its state is not known.<ref>{{cite conference |first=Brian W. |last=Kernighan |date=April 24–25, 1991 |url=https://www.cs.princeton.edu/~bwk/btl.mirror/awkc++.pdf |title=An AWK to C++ Translator |event=Usenix C++ Conference |location=Washington, DC |pages=217–228}}</ref> |
Old versions of Unix, such as [[UNIX/32V]], included <code>awkcc</code>, which converted AWK to C. Kernighan wrote a program to turn awk into C++; its state is not known.<ref>{{cite conference |first=Brian W. |last=Kernighan |date=April 24–25, 1991 |url=https://www.cs.princeton.edu/~bwk/btl.mirror/awkc++.pdf |title=An AWK to C++ Translator |event=Usenix C++ Conference |location=Washington, DC |pages=217–228 |conference= |access-date=2020-02-01 |archive-date=2020-06-22 |archive-url=https://web.archive.org/web/20200622061725/https://www.cs.princeton.edu/~bwk/btl.mirror/awkc++.pdf |url-status=live }}</ref> |
||
* '''BWK awk''', also known as '''nawk''', refers to the version by [[Brian Kernighan]]. It has been dubbed the "One True AWK" because of the use of the term in association with the book that originally described the language and the fact that Kernighan was one of the original authors of AWK.<ref name = "AWK1">{{cite book | title= The AWK Programming Language |first1=Alfred V. |last1=Aho |first2=Brian W. |last2=Kernighan |first3=Peter J. |last3=Weinberger | year= 1988 | publisher= Addison-Wesley Publishing Company | isbn= 9780201079814 |url = https://archive.org/details/pdfy-MgN0H1joIoDVoIC7 | access-date = 16 May 2015 }}</ref> FreeBSD refers to this version as ''one-true-awk''.<ref>{{cite web |url=http://www.freebsd.org/cgi/cvsweb.cgi/src/contrib/one-true-awk/FREEBSD-upgrade?rev=1.9&content-type=text/x-cvsweb-markup |archive-url=https://web.archive.org/web/20130908180035/http://www.freebsd.org/cgi/cvsweb.cgi/src/contrib/one-true-awk/FREEBSD-upgrade?rev=1.9&content-type=text%2Fx-cvsweb-markup |archive-date=September 8, 2013 |title=FreeBSD's work log for importing BWK awk into FreeBSD's core |date=May 16, 2005 |access-date=September 20, 2006 |url-status=live }}</ref> This version also has features not in the book, such as <code>tolower</code> and <code>ENVIRON</code> that are explained above; see the FIXES file in the source archive for details. This version is used by, for example, [[Android (operating system)|Android]], [[FreeBSD]], [[NetBSD]], [[OpenBSD]], [[macOS]], and [[illumos]]. Brian Kernighan and Arnold Robbins are the main contributors to a source repository for ''nawk'': {{URL|https://github.com/onetrueawk/awk}}. |
* '''BWK awk''', also known as '''nawk''', refers to the version by [[Brian Kernighan]]. It has been dubbed the "One True AWK" because of the use of the term in association with the book that originally described the language and the fact that Kernighan was one of the original authors of AWK.<ref name = "AWK1">{{cite book | title= The AWK Programming Language |first1=Alfred V. |last1=Aho |first2=Brian W. |last2=Kernighan |first3=Peter J. |last3=Weinberger | year= 1988 | publisher= Addison-Wesley Publishing Company | isbn= 9780201079814 |url = https://archive.org/details/pdfy-MgN0H1joIoDVoIC7 | access-date = 16 May 2015 }}</ref> FreeBSD refers to this version as ''one-true-awk''.<ref>{{cite web |url=http://www.freebsd.org/cgi/cvsweb.cgi/src/contrib/one-true-awk/FREEBSD-upgrade?rev=1.9&content-type=text/x-cvsweb-markup |archive-url=https://web.archive.org/web/20130908180035/http://www.freebsd.org/cgi/cvsweb.cgi/src/contrib/one-true-awk/FREEBSD-upgrade?rev=1.9&content-type=text%2Fx-cvsweb-markup |archive-date=September 8, 2013 |title=FreeBSD's work log for importing BWK awk into FreeBSD's core |date=May 16, 2005 |access-date=September 20, 2006 |url-status=live }}</ref> This version also has features not in the book, such as <code>tolower</code> and <code>ENVIRON</code> that are explained above; see the FIXES file in the source archive for details. This version is used by, for example, [[Android (operating system)|Android]], [[FreeBSD]], [[NetBSD]], [[OpenBSD]], [[macOS]], and [[illumos]]. Brian Kernighan and Arnold Robbins are the main contributors to a source repository for ''nawk'': {{URL|https://github.com/onetrueawk/awk}}. |
||
* '''gawk''' ([[GNU]] awk) is another free-software implementation and the only implementation that makes serious progress implementing [[internationalization and localization]] and TCP/IP networking. It was written before the original implementation became freely available. It includes its own debugger, and its [[profiling (computer programming)|profiler]] enables the user to make measured performance enhancements to a script. It also enables the user to extend functionality with shared libraries. Some [[Linux distribution]]s include ''gawk'' as their default AWK implementation.{{Citation needed|date=September 2018}} |
* '''gawk''' ([[GNU]] awk) is another free-software implementation and the only implementation that makes serious progress implementing [[internationalization and localization]] and TCP/IP networking. It was written before the original implementation became freely available. It includes its own debugger, and its [[profiling (computer programming)|profiler]] enables the user to make measured performance enhancements to a script. It also enables the user to extend functionality with shared libraries. Some [[Linux distribution]]s include ''gawk'' as their default AWK implementation.{{Citation needed|date=September 2018}} As of version 5.2 (September 2022) ''gawk'' includes a persistent memory feature that can remember script-defined variables and functions from one invocation of a script to the next and pass data between unrelated scripts, as described in the Persistent-Memory ''gawk'' User Manual: {{URL|https://www.gnu.org/software/gawk/manual/pm-gawk/}}. |
||
** '''gawk-csv'''. The [[Comma-separated values|CSV]] extension of ''gawk |
** '''gawk-csv'''. The [[Comma-separated values|CSV]] extension of ''gawk'' provides facilities for inputting and outputting CSV formatted data.<ref>{{cite web | title=CSV Processing With gawk (using the gawk-csv extension)| website=gawkextlib |year=2018 | url=https://gawkextlib.sourceforge.net/csv/gawk-csv.htmlurl-statuse=live|archive-url=https://web.archive.org/web/20200325201153/http://gawkextlib.sourceforge.net/csv/gawk-csv.html |archive-date=2020-03-25}}</ref> |
||
* '''mawk''' is a very fast AWK implementation by Mike Brennan based on a [[bytecode]] interpreter. |
* '''mawk''' is a very fast AWK implementation by Mike Brennan based on a [[bytecode]] interpreter. |
||
* '''libmawk''' is a fork of mawk, allowing applications to embed multiple parallel instances of awk interpreters. |
* '''libmawk''' is a fork of mawk, allowing applications to embed multiple parallel instances of awk interpreters. |
||
* '''awka''' (whose front end is written atop the ''mawk'' program) is another translator of AWK scripts into C code. When compiled, statically including the author's libawka.a, the resulting executables are considerably sped up and, according to the author's tests, compare very well with other versions of AWK, [[Perl]], or [[Tcl]]. Small scripts will turn into programs of 160–170 kB. |
* '''awka''' (whose front end is written atop the ''mawk'' program) is another translator of AWK scripts into C code. When compiled, statically including the author's libawka.a, the resulting executables are considerably sped up and, according to the author's tests, compare very well with other versions of AWK, [[Perl]], or [[Tcl]]. Small scripts will turn into programs of 160–170 kB. |
||
* '''tawk''' (Thompson AWK) is an AWK [[compiler]] for [[Solaris (operating system)|Solaris]], [[DOS]], [[OS/2]], and [[Microsoft Windows|Windows]], previously sold by Thompson Automation Software (which has ceased its activities).<ref>{{cite news |url=https://www.drdobbs.com/tools/examining-the-tawk-compiler/184410193 |work=[[Dr. Dobb's Journal]] |author=James K. Lawless |date=May 1, 1997 |title=Examining the TAWK Compiler }}</ref> |
* '''tawk''' (Thompson AWK) is an AWK [[compiler]] for [[Solaris (operating system)|Solaris]], [[DOS]], [[OS/2]], and [[Microsoft Windows|Windows]], previously sold by Thompson Automation Software (which has ceased its activities).<ref>{{cite news |url=https://www.drdobbs.com/tools/examining-the-tawk-compiler/184410193 |work=[[Dr. Dobb's Journal]] |author=James K. Lawless |date=May 1, 1997 |title=Examining the TAWK Compiler |access-date=February 21, 2020 |archive-date=February 21, 2020 |archive-url=https://web.archive.org/web/20200221191605/https://www.drdobbs.com/tools/examining-the-tawk-compiler/184410193 |url-status=live }}</ref> |
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* '''Jawk''' is a project to implement AWK in [[Java (programming language)|Java]], hosted on SourceForge.<ref> |
* '''Jawk''' is a project to implement AWK in [[Java (programming language)|Java]], hosted on SourceForge.<ref>{{Cite web |url=http://sourceforge.net/projects/jawk/ |title=''Jawk'' at SourceForge |access-date=2006-08-23 |archive-date=2007-05-27 |archive-url=https://web.archive.org/web/20070527021808/http://sourceforge.net/projects/jawk |url-status=live }}</ref> Extensions to the language are added to provide access to Java features within AWK scripts (i.e., Java threads, sockets, collections, etc.). |
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* '''xgawk''' is a fork of ''gawk''<ref> |
* '''xgawk''' is a fork of ''gawk''<ref>{{Cite web |url=http://gawkextlib.sourceforge.net/ |title=''xgawk'' Home Page |access-date=2013-05-07 |archive-date=2013-04-18 |archive-url=https://web.archive.org/web/20130418224130/http://gawkextlib.sourceforge.net/ |url-status=live }}</ref> that extends ''gawk'' with dynamically loadable libraries. The XMLgawk extension was integrated into the official GNU Awk release 4.1.0. |
||
* '''QSEAWK''' is an embedded AWK interpreter implementation included in the QSE library that provides embedding [[application programming interface]] (API) for [[C (programming language)|C]] and [[C++]].<ref> |
* '''QSEAWK''' is an embedded AWK interpreter implementation included in the QSE library that provides embedding [[application programming interface]] (API) for [[C (programming language)|C]] and [[C++]].<ref>{{Cite web |url=https://github.com/hyung-hwan/qse |title=QSEAWK at GitHub |website=[[GitHub]] |access-date=2017-09-06 |archive-date=2018-06-11 |archive-url=https://web.archive.org/web/20180611001042/https://github.com/hyung-hwan/qse |url-status=live }}</ref> |
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* '''libfawk''' is a very small, function-only, reentrant, embeddable interpreter written in C |
* '''libfawk''' is a very small, function-only, reentrant, embeddable interpreter written in C |
||
* '''[[BusyBox]]''' includes an AWK implementation written by Dmitry Zakharov. This is a very small implementation suitable for embedded systems. |
* '''[[BusyBox]]''' includes an AWK implementation written by Dmitry Zakharov. This is a very small implementation suitable for embedded systems. |
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* '''CLAWK''' by Michael Parker provides an AWK implementation in [[Common Lisp]], based upon the regular expression library of the same author.<ref> |
* '''CLAWK''' by Michael Parker provides an AWK implementation in [[Common Lisp]], based upon the regular expression library of the same author.<ref>{{Cite web |url=https://github.com/sharplispers/clawk |title=CLAWK at GitHub |website=[[GitHub]] |access-date=2021-06-01 |archive-date=2021-08-25 |archive-url=https://web.archive.org/web/20210825102602/https://github.com/sharplispers/clawk |url-status=live }}</ref> |
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* '''goawk''' is an AWK implementation in Go with a few convenience extensions by Ben Hoyt, hosted on [https://github.com/benhoyt/goawk Github]. |
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The gawk manual has a list of more AWK implementations.<ref>{{cite book |chapter-url=https://www.gnu.org/software/gawk/manual/html_node/Other-Versions.html |title=GAWK: Effective AWK Programming: A User's Guide for GNU Awk |chapter=B.5 Other Freely Available awk Implementations}}</ref> |
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== Books == |
== Books == |
||
Line 349: | Line 355: | ||
|isbn = 0-201-07981-X |
|isbn = 0-201-07981-X |
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|url-access = registration |
|url-access = registration |
||
}} |
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* {{cite book |
|||
|last1 = Aho |
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|first1 = Alfred V. |
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|author-link1 = Alfred Aho |
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|last2 = Kernighan |
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|first2 = Brian W. |
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|author-link2 = Brian Kernighan |
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|last3 = Weinberger |
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|first3 = Peter J. |
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|author-link3 = Peter J. Weinberger |
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|title = The AWK Programming Language, Second Edition |
|||
|date = 2023-09-06 |
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|publisher = [[Addison-Wesley|Addison-Wesley Professional]] |
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|location = Hoboken, New Jersey |
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|isbn = 978-0-13-826972-2 |
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|url = https://awk.dev |
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|url-status = live |
|||
|access-date = 2023-11-03 |
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|archive-url = https://web.archive.org/web/20231027062708/https://awk.dev/ |
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|archive-date = 2023-10-27 |
|||
}} |
}} |
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* {{cite book |
* {{cite book |
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| date = 2000-12-01 |
| date = 2000-12-01 |
||
| work = Common threads |
| work = Common threads |
||
| publisher = |
| publisher = IBM DeveloperWorks |
||
}} |
}} |
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* {{cite web |
* {{cite web |
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{{Wikibooks|An Awk Primer}} |
{{Wikibooks|An Awk Primer}} |
||
* [https://web.archive.org/web/20120207095326/http://doc.cat-v.org/henry_spencer/amazing_awk_assembler/ The Amazing Awk Assembler] by [[Henry Spencer]]. |
* [https://web.archive.org/web/20120207095326/http://doc.cat-v.org/henry_spencer/amazing_awk_assembler/ The Amazing Awk Assembler] by [[Henry Spencer]]. |
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* {{cite web |title=AWK (formerly) at Curlie |url=https://curlie.org/Computers/Programming/Languages/Awk |website=[[Curlie]] |archive-url=https://web.archive.org/web/20220318040955/https://curlie.org/Computers/Programming/Languages/Awk |archive-date=2022-03-18 |language=en |url-status=dead}} |
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* {{Curlie|Computers/Programming/Languages/Awk}} |
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* [http://awklang.org awklang.org] The site for things related to the awk language |
* [http://awklang.org awklang.org] The site for things related to the awk language |
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{{ |
{{Unix commands}} |
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⚫ | |||
{{Authority control}} |
{{Authority control}} |
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[[Category:1977 software]] |
[[Category:1977 software]] |
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[[Category:Cross-platform software]] |
[[Category:Cross-platform software]] |
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[[Category: |
[[Category:Domain-specific programming languages]] |
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[[Category:Free and open source interpreters]] |
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[[Category:Pattern matching programming languages]] |
[[Category:Pattern matching programming languages]] |
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[[Category:Plan 9 commands]] |
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⚫ | |||
[[Category:Scripting languages]] |
[[Category:Scripting languages]] |
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[[Category:Domain-specific programming languages]] |
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[[Category:Standard Unix programs]] |
[[Category:Standard Unix programs]] |
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[[Category:Text-oriented programming languages]] |
[[Category:Text-oriented programming languages]] |
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[[Category:Unix SUS2008 utilities]] |
[[Category:Unix SUS2008 utilities]] |
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[[Category:Unix text processing utilities]] |
[[Category:Unix text processing utilities]] |
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⚫ | |||
⚫ |
Latest revision as of 05:19, 25 December 2024
Paradigm | Scripting, procedural, data-driven[1] |
---|---|
Designed by | Alfred Aho, Peter Weinberger, and Brian Kernighan |
First appeared | 1977 |
Stable release | IEEE Std 1003.1-2008 (POSIX) / 1985
|
Typing discipline | none; can handle strings, integers and floating-point numbers; regular expressions |
OS | Cross-platform |
Major implementations | |
awk, GNU Awk, mawk, nawk, MKS AWK, Thompson AWK (compiler), Awka (compiler) | |
Dialects | |
old awk oawk 1977, new awk nawk 1985, GNU Awk gawk | |
Influenced by | |
C, sed, SNOBOL[2][3] | |
Influenced | |
Tcl, AMPL, Perl, Korn Shell (ksh93, dtksh, tksh), Lua |
AWK (/ɔːk/[4]) is a domain-specific language designed for text processing and typically used as a data extraction and reporting tool. Like sed and grep, it is a filter,[4] and it is a standard feature of most Unix-like operating systems.
The AWK language is a data-driven scripting language consisting of a set of actions to be taken against streams of textual data – either run directly on files or used as part of a pipeline – for purposes of extracting or transforming text, such as producing formatted reports. The language extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and regular expressions. While AWK has a limited intended application domain and was especially designed to support one-liner programs, the language is Turing-complete, and even the early Bell Labs users of AWK often wrote well-structured large AWK programs.[5]
AWK was created at Bell Labs in the 1970s,[6] and its name is derived from the surnames of its authors: Alfred Aho (author of egrep), Peter Weinberger (who worked on tiny relational databases), and Brian Kernighan. The acronym is pronounced the same as the name of the bird species auk, which is illustrated on the cover of The AWK Programming Language.[7] When written in all lowercase letters, as awk
, it refers to the Unix or Plan 9 program that runs scripts written in the AWK programming language.
History
[edit]According to Brian Kernighan, one of the goals of AWK was to have a tool that would easily manipulate both numbers and strings. AWK was also inspired by Marc Rochkind's programming language that was used to search for patterns in input data, and was implemented using yacc.[8]
As one of the early tools to appear in Version 7 Unix, AWK added computational features to a Unix pipeline besides the Bourne shell, the only scripting language available in a standard Unix environment. It is one of the mandatory utilities of the Single UNIX Specification,[9] and is required by the Linux Standard Base specification.[10]
In 1983, AWK was one of several UNIX tools available for Charles River Data Systems' UNOS operating system under Bell Laboratories license.[11]
AWK was significantly revised and expanded in 1985–88, resulting in the GNU AWK implementation written by Paul Rubin, Jay Fenlason, and Richard Stallman, released in 1988.[12] GNU AWK may be the most widely deployed version[13] because it is included with GNU-based Linux packages. GNU AWK has been maintained solely by Arnold Robbins since 1994.[12] Brian Kernighan's nawk (New AWK) source was first released in 1993 unpublicized, and publicly since the late 1990s; many BSD systems use it to avoid the GPL license.[12]
AWK was preceded by sed (1974). Both were designed for text processing. They share the line-oriented, data-driven paradigm, and are particularly suited to writing one-liner programs, due to the implicit main loop and current line variables. The power and terseness of early AWK programs – notably the powerful regular expression handling and conciseness due to implicit variables, which facilitate one-liners – together with the limitations of AWK at the time, were important inspirations for the Perl language (1987). In the 1990s, Perl became very popular, competing with AWK in the niche of Unix text-processing languages.
Structure of AWK programs
[edit]AWK reads the input a line at a time. A line is scanned for each pattern in the program, and for each pattern that matches, the associated action is executed.
— Alfred V. Aho[14]
An AWK program is a series of pattern action pairs, written as:
condition { action }
condition { action }
...
where condition is typically an expression and action is a series of commands. The input is split into records, where by default records are separated by newline characters so that the input is split into lines. The program tests each record against each of the conditions in turn, and executes the action for each expression that is true. Either the condition or the action may be omitted. The condition defaults to matching every record. The default action is to print the record. This is the same pattern-action structure as sed.
In addition to a simple AWK expression, such as foo == 1
or /^foo/
, the condition can be BEGIN
or END
causing the action to be executed before or after all records have been read, or pattern1, pattern2 which matches the range of records starting with a record that matches pattern1 up to and including the record that matches pattern2 before again trying to match against pattern1 on subsequent lines.
In addition to normal arithmetic and logical operators, AWK expressions include the tilde operator, ~
, which matches a regular expression against a string. As handy syntactic sugar, /regexp/ without using the tilde operator matches against the current record; this syntax derives from sed, which in turn inherited it from the ed editor, where /
is used for searching. This syntax of using slashes as delimiters for regular expressions was subsequently adopted by Perl and ECMAScript, and is now common. The tilde operator was also adopted by Perl.
Commands
[edit]AWK commands are the statements that are substituted for action in the examples above. AWK commands can include function calls, variable assignments, calculations, or any combination thereof. AWK contains built-in support for many functions; many more are provided by the various flavors of AWK. Also, some flavors support the inclusion of dynamically linked libraries, which can also provide more functions.
The print command
[edit]The print command is used to output text. The output text is always terminated with a predefined string called the output record separator (ORS) whose default value is a newline. The simplest form of this command is:
print
- This displays the contents of the current record. In AWK, records are broken down into fields, and these can be displayed separately:
print $1
- Displays the first field of the current record
print $1, $3
- Displays the first and third fields of the current record, separated by a predefined string called the output field separator (OFS) whose default value is a single space character
Although these fields ($X) may bear resemblance to variables (the $ symbol indicates variables in the usual Unix shells and in Perl), they actually refer to the fields of the current record. A special case, $0, refers to the entire record. In fact, the commands "print
" and "print $0
" are identical in functionality.
The print command can also display the results of calculations and/or function calls:
/regex_pattern/ {
# Actions to perform in the event the record (line) matches the above regex_pattern
print 3+2
print foobar(3)
print foobar(variable)
print sin(3-2)
}
Output may be sent to a file:
/regex_pattern/ {
# Actions to perform in the event the record (line) matches the above regex_pattern
print "expression" > "file name"
}
or through a pipe:
/regex_pattern/ {
# Actions to perform in the event the record (line) matches the above regex_pattern
print "expression" | "command"
}
Built-in variables
[edit]AWK's built-in variables include the field variables: $1, $2, $3, and so on ($0 represents the entire record). They hold the text or values in the individual text-fields in a record.
Other variables include:
NR
: Number of Records. Keeps a current count of the number of input records read so far from all data files. It starts at zero, but is never automatically reset to zero.[15]FNR
: File Number of Records. Keeps a current count of the number of input records read so far in the current file. This variable is automatically reset to zero each time a new file is started.[15]NF
: Number of Fields. Contains the number of fields in the current input record. The last field in the input record can be designated by $NF, the 2nd-to-last field by $(NF-1), the 3rd-to-last field by $(NF-2), etc.FILENAME
: Contains the name of the current input-file.FS
: Field Separator. Contains the "field separator" used to divide fields in the input record. The default, "white space", allows any sequence of space and tab characters. FS can be reassigned with another character or character sequence to change the field separator.RS
: Record Separator. Stores the current "record separator" character. Since, by default, an input line is the input record, the default record separator character is a "newline".OFS
: Output Field Separator. Stores the "output field separator", which separates the fields when awk prints them. The default is a "space" character.ORS
: Output Record Separator. Stores the "output record separator", which separates the output records when awk prints them. The default is a "newline" character.OFMT
: Output Format. Stores the format for numeric output. The default format is "%.6g".
Variables and syntax
[edit]Variable names can use any of the characters [A-Za-z0-9_], with the exception of language keywords, and cannot begin with a numeric digit. The operators + - * / represent addition, subtraction, multiplication, and division, respectively. For string concatenation, simply place two variables (or string constants) next to each other. It is optional to use a space in between if string constants are involved, but two variable names placed adjacent to each other require a space in between. Double quotes delimit string constants. Statements need not end with semicolons. Finally, comments can be added to programs by using # as the first character on a line, or behind a command or sequence of commands.
User-defined functions
[edit]In a format similar to C, function definitions consist of the keyword function
, the function name, argument names and the function body. Here is an example of a function.
function add_three(number) {
return number + 3
}
This statement can be invoked as follows:
(pattern) {
print add_three(36) # Outputs '''39'''
}
Functions can have variables that are in the local scope. The names of these are added to the end of the argument list, though values for these should be omitted when calling the function. It is convention to add some whitespace in the argument list before the local variables, to indicate where the parameters end and the local variables begin.
Examples
[edit]Hello, World!
[edit]Here is the customary "Hello, World!" program written in AWK:
BEGIN {
print "Hello, world!"
exit
}
Print lines longer than 80 characters
[edit]Print all lines longer than 80 characters. The default action is to print the current line.
length($0) > 80
Count words
[edit]Count words in the input and print the number of lines, words, and characters (like wc):
{
words += NF
chars += length + 1 # add one to account for the newline character at the end of each record (line)
}
END { print NR, words, chars }
As there is no pattern for the first line of the program, every line of input matches by default, so the increment actions are executed for every line. words += NF
is shorthand for words = words + NF
.
Sum last word
[edit]{ s += $NF }
END { print s + 0 }
s is incremented by the numeric value of $NF, which is the last word on the line as defined by AWK's field separator (by default, white-space). NF is the number of fields in the current line, e.g. 4. Since $4 is the value of the fourth field, $NF is the value of the last field in the line regardless of how many fields this line has, or whether it has more or fewer fields than surrounding lines. $ is actually a unary operator with the highest operator precedence. (If the line has no fields, then NF is 0, $0 is the whole line, which in this case is empty apart from possible white-space, and so has the numeric value 0.)
At the end of the input the END pattern matches, so s is printed. However, since there may have been no lines of input at all, in which case no value has ever been assigned to s, it will by default be an empty string. Adding zero to a variable is an AWK idiom for coercing it from a string to a numeric value. (Concatenating an empty string is to coerce from a number to a string, e.g. s "". Note, there's no operator to concatenate strings, they're just placed adjacently.) With the coercion the program prints "0" on an empty input, without it, an empty line is printed.
Match a range of input lines
[edit]NR % 4 == 1, NR % 4 == 3 { printf "%6d %s\n", NR, $0 }
The action statement prints each line numbered. The printf function emulates the standard C printf and works similarly to the print command described above. The pattern to match, however, works as follows: NR is the number of records, typically lines of input, AWK has so far read, i.e. the current line number, starting at 1 for the first line of input. % is the modulo operator. NR % 4 == 1 is true for the 1st, 5th, 9th, etc., lines of input. Likewise, NR % 4 == 3 is true for the 3rd, 7th, 11th, etc., lines of input. The range pattern is false until the first part matches, on line 1, and then remains true up to and including when the second part matches, on line 3. It then stays false until the first part matches again on line 5.
Thus, the program prints lines 1,2,3, skips line 4, and then 5,6,7, and so on. For each line, it prints the line number (on a 6 character-wide field) and then the line contents. For example, when executed on this input:
Rome Florence Milan Naples Turin Venice
The previous program prints:
1 Rome 2 Florence 3 Milan 5 Turin 6 Venice
Printing the initial or the final part of a file
[edit]As a special case, when the first part of a range pattern is constantly true, e.g. 1, the range will start at the beginning of the input. Similarly, if the second part is constantly false, e.g. 0, the range will continue until the end of input. For example,
/^--cut here--$/, 0
prints lines of input from the first line matching the regular expression ^--cut here--$, that is, a line containing only the phrase "--cut here--", to the end.
Calculate word frequencies
[edit]Word frequency using associative arrays:
BEGIN {
FS="[^a-zA-Z]+"
}
{
for (i=1; i<=NF; i++)
words[tolower($i)]++
}
END {
for (i in words)
print i, words[i]
}
The BEGIN block sets the field separator to any sequence of non-alphabetic characters. Separators can be regular expressions. After that, we get to a bare action, which performs the action on every input line. In this case, for every field on the line, we add one to the number of times that word, first converted to lowercase, appears. Finally, in the END block, we print the words with their frequencies. The line
for (i in words)
creates a loop that goes through the array words, setting i to each subscript of the array. This is different from most languages, where such a loop goes through each value in the array. The loop thus prints out each word followed by its frequency count. tolower
was an addition to the One True awk (see below) made after the book was published.
Match pattern from command line
[edit]This program can be represented in several ways. The first one uses the Bourne shell to make a shell script that does everything. It is the shortest of these methods:
#!/bin/sh
pattern="$1"
shift
awk '/'"$pattern"'/ { print FILENAME ":" $0 }' "$@"
The $pattern
in the awk command is not protected by single quotes so that the shell does expand the variable but it needs to be put in double quotes to properly handle patterns containing spaces. A pattern by itself in the usual way checks to see if the whole line ($0
) matches. FILENAME
contains the current filename. awk has no explicit concatenation operator; two adjacent strings concatenate them. $0
expands to the original unchanged input line.
There are alternate ways of writing this. This shell script accesses the environment directly from within awk:
#!/bin/sh
export pattern="$1"
shift
awk '$0 ~ ENVIRON["pattern"] { print FILENAME ":" $0 }' "$@"
This is a shell script that uses ENVIRON
, an array introduced in a newer version of the One True awk after the book was published. The subscript of ENVIRON
is the name of an environment variable; its result is the variable's value. This is like the getenv function in various standard libraries and POSIX. The shell script makes an environment variable pattern
containing the first argument, then drops that argument and has awk look for the pattern in each file.
~
checks to see if its left operand matches its right operand; !~
is its inverse. A regular expression is just a string and can be stored in variables.
The next way uses command-line variable assignment, in which an argument to awk can be seen as an assignment to a variable:
#!/bin/sh
pattern="$1"
shift
awk '$0 ~ pattern { print FILENAME ":" $0 }' pattern="$pattern" "$@"
Or You can use the -v var=value command line option (e.g. awk -v pattern="$pattern" ...).
Finally, this is written in pure awk, without help from a shell or without the need to know too much about the implementation of the awk script (as the variable assignment on command line one does), but is a bit lengthy:
BEGIN {
pattern = ARGV[1]
for (i = 1; i < ARGC; i++) # remove first argument
ARGV[i] = ARGV[i + 1]
ARGC--
if (ARGC == 1) { # the pattern was the only thing, so force read from standard input (used by book)
ARGC = 2
ARGV[1] = "-"
}
}
$0 ~ pattern { print FILENAME ":" $0 }
The BEGIN
is necessary not only to extract the first argument, but also to prevent it from being interpreted as a filename after the BEGIN
block ends. ARGC
, the number of arguments, is always guaranteed to be ≥1, as ARGV[0]
is the name of the command that executed the script, most often the string "awk"
. ARGV[ARGC]
is the empty string, ""
. #
initiates a comment that expands to the end of the line.
Note the if
block. awk only checks to see if it should read from standard input before it runs the command. This means that
awk 'prog'
only works because the fact that there are no filenames is only checked before prog
is run! If you explicitly set ARGC
to 1 so that there are no arguments, awk will simply quit because it feels there are no more input files. Therefore, you need to explicitly say to read from standard input with the special filename -
.
Self-contained AWK scripts
[edit]On Unix-like operating systems self-contained AWK scripts can be constructed using the shebang syntax.
For example, a script that sends the content of a given file to standard output may be built by creating a file named print.awk
with the following content:
#!/usr/bin/awk -f
{ print $0 }
It can be invoked with: ./print.awk <filename>
The -f
tells awk that the argument that follows is the file to read the AWK program from, which is the same flag that is used in sed. Since they are often used for one-liners, both these programs default to executing a program given as a command-line argument, rather than a separate file.
Versions and implementations
[edit]AWK was originally written in 1977 and distributed with Version 7 Unix.
In 1985 its authors started expanding the language, most significantly by adding user-defined functions. The language is described in the book The AWK Programming Language, published 1988, and its implementation was made available in releases of UNIX System V. To avoid confusion with the incompatible older version, this version was sometimes called "new awk" or nawk. This implementation was released under a free software license in 1996 and is still maintained by Brian Kernighan (see external links below).[citation needed]
Old versions of Unix, such as UNIX/32V, included awkcc
, which converted AWK to C. Kernighan wrote a program to turn awk into C++; its state is not known.[16]
- BWK awk, also known as nawk, refers to the version by Brian Kernighan. It has been dubbed the "One True AWK" because of the use of the term in association with the book that originally described the language and the fact that Kernighan was one of the original authors of AWK.[7] FreeBSD refers to this version as one-true-awk.[17] This version also has features not in the book, such as
tolower
andENVIRON
that are explained above; see the FIXES file in the source archive for details. This version is used by, for example, Android, FreeBSD, NetBSD, OpenBSD, macOS, and illumos. Brian Kernighan and Arnold Robbins are the main contributors to a source repository for nawk: github.com /onetrueawk /awk. - gawk (GNU awk) is another free-software implementation and the only implementation that makes serious progress implementing internationalization and localization and TCP/IP networking. It was written before the original implementation became freely available. It includes its own debugger, and its profiler enables the user to make measured performance enhancements to a script. It also enables the user to extend functionality with shared libraries. Some Linux distributions include gawk as their default AWK implementation.[citation needed] As of version 5.2 (September 2022) gawk includes a persistent memory feature that can remember script-defined variables and functions from one invocation of a script to the next and pass data between unrelated scripts, as described in the Persistent-Memory gawk User Manual: www
.gnu .org /software /gawk /manual /pm-gawk /. - mawk is a very fast AWK implementation by Mike Brennan based on a bytecode interpreter.
- libmawk is a fork of mawk, allowing applications to embed multiple parallel instances of awk interpreters.
- awka (whose front end is written atop the mawk program) is another translator of AWK scripts into C code. When compiled, statically including the author's libawka.a, the resulting executables are considerably sped up and, according to the author's tests, compare very well with other versions of AWK, Perl, or Tcl. Small scripts will turn into programs of 160–170 kB.
- tawk (Thompson AWK) is an AWK compiler for Solaris, DOS, OS/2, and Windows, previously sold by Thompson Automation Software (which has ceased its activities).[19]
- Jawk is a project to implement AWK in Java, hosted on SourceForge.[20] Extensions to the language are added to provide access to Java features within AWK scripts (i.e., Java threads, sockets, collections, etc.).
- xgawk is a fork of gawk[21] that extends gawk with dynamically loadable libraries. The XMLgawk extension was integrated into the official GNU Awk release 4.1.0.
- QSEAWK is an embedded AWK interpreter implementation included in the QSE library that provides embedding application programming interface (API) for C and C++.[22]
- libfawk is a very small, function-only, reentrant, embeddable interpreter written in C
- BusyBox includes an AWK implementation written by Dmitry Zakharov. This is a very small implementation suitable for embedded systems.
- CLAWK by Michael Parker provides an AWK implementation in Common Lisp, based upon the regular expression library of the same author.[23]
- goawk is an AWK implementation in Go with a few convenience extensions by Ben Hoyt, hosted on Github.
The gawk manual has a list of more AWK implementations.[24]
Books
[edit]- Aho, Alfred V.; Kernighan, Brian W.; Weinberger, Peter J. (1988-01-01). The AWK Programming Language. New York, NY: Addison-Wesley. ISBN 0-201-07981-X. Retrieved 2017-01-22.
- Aho, Alfred V.; Kernighan, Brian W.; Weinberger, Peter J. (2023-09-06). The AWK Programming Language, Second Edition. Hoboken, New Jersey: Addison-Wesley Professional. ISBN 978-0-13-826972-2. Archived from the original on 2023-10-27. Retrieved 2023-11-03.
- Robbins, Arnold (2001-05-15). Effective awk Programming (3rd ed.). Sebastopol, CA: O'Reilly Media. ISBN 0-596-00070-7. Retrieved 2009-04-16.
- Dougherty, Dale; Robbins, Arnold (1997-03-01). sed & awk (2nd ed.). Sebastopol, CA: O'Reilly Media. ISBN 1-56592-225-5. Retrieved 2009-04-16.
- Robbins, Arnold (2000). Effective Awk Programming: A User's Guide for Gnu Awk (1.0.3 ed.). Bloomington, IN: iUniverse. ISBN 0-595-10034-1. Archived from the original on 12 April 2009. Retrieved 2009-04-16.
See also
[edit]References
[edit]- ^ Stutz, Michael (September 19, 2006). "Get started with GAWK: AWK language fundamentals" (PDF). developerWorks. IBM. Archived (PDF) from the original on 2015-04-27. Retrieved 2015-01-29.
[AWK is] often called a data-driven language -- the program statements describe the input data to match and process rather than a sequence of program steps
- ^ Andreas J. Pilavakis (1989). UNIX Workshop. Macmillan International Higher Education. p. 196.
- ^ Arnold Robbins (2015). Effective Awk Programming: Universal Text Processing and Pattern Matching (4th ed.). O'Reilly Media. p. 560.
- ^ a b James W. Livingston (May 2, 1988). "The Great awk Program is No Birdbrain". Digital Review. p. 91.
- ^ Raymond, Eric S. "Applying Minilanguages". The Art of Unix Programming. Case Study: awk. Archived from the original on July 30, 2008. Retrieved May 11, 2010.
The awk action language is Turing-complete, and can read and write files.
- ^ Aho, Alfred V.; Kernighan, Brian W.; Weinberger, Peter J. (September 1, 1978). Awk — A Pattern Scanning and Processing Language (Second Edition) (Technical report). Unix Seventh Edition Manual, Volume 2. Bell Telephone Laboratories, Inc. Retrieved February 1, 2020.
- ^ a b Aho, Alfred V.; Kernighan, Brian W.; Weinberger, Peter J. (1988). The AWK Programming Language. Addison-Wesley Publishing Company. ISBN 9780201079814. Retrieved 16 May 2015.
- ^ "UNIX Special: Profs Kernighan & Brailsford". Computerphile. September 30, 2015. Archived from the original on 2021-11-22.
- ^ "The Single UNIX Specification, Version 3, Utilities Interface Table". Archived from the original on 2018-01-05. Retrieved 2005-12-18.
- ^ "Chapter 15. Commands and Utilities". Linux Standard Base Core Specification 4.0 (Technical report). Linux Foundation. 2008. Archived from the original on 2019-10-16. Retrieved 2020-02-01.
- ^ The Insider's Guide To The Universe (PDF). Charles River Data Systems, Inc. 1983. p. 13.
- ^ a b c Robbins, Arnold (March 2014). "The GNU Project and Me: 27 Years with GNU AWK" (PDF). skeeve.com. Archived (PDF) from the original on October 6, 2014. Retrieved October 4, 2014.
- ^ Dougherty, Dale; Robbins, Arnold (1997). sed & awk (2nd ed.). Sebastopol, CA: O'Reilly. p. 221. ISBN 1-565-92225-5.
- ^ Hamilton, Naomi (May 30, 2008). "The A-Z of Programming Languages: AWK". Computerworld. Archived from the original on 2020-02-01. Retrieved 2008-12-12.
- ^ a b "Records (The GNU AWK User's Guide)". Archived from the original on 2020-06-14. Retrieved 2020-05-23.
- ^ Kernighan, Brian W. (April 24–25, 1991). An AWK to C++ Translator (PDF). Usenix C++ Conference. Washington, DC. pp. 217–228. Archived (PDF) from the original on 2020-06-22. Retrieved 2020-02-01.
- ^ "FreeBSD's work log for importing BWK awk into FreeBSD's core". May 16, 2005. Archived from the original on September 8, 2013. Retrieved September 20, 2006.
- ^ "CSV Processing With gawk (using the gawk-csv extension)". gawkextlib. 2018. Archived from the original on 2020-03-25.
- ^ James K. Lawless (May 1, 1997). "Examining the TAWK Compiler". Dr. Dobb's Journal. Archived from the original on February 21, 2020. Retrieved February 21, 2020.
- ^ "Jawk at SourceForge". Archived from the original on 2007-05-27. Retrieved 2006-08-23.
- ^ "xgawk Home Page". Archived from the original on 2013-04-18. Retrieved 2013-05-07.
- ^ "QSEAWK at GitHub". GitHub. Archived from the original on 2018-06-11. Retrieved 2017-09-06.
- ^ "CLAWK at GitHub". GitHub. Archived from the original on 2021-08-25. Retrieved 2021-06-01.
- ^ "B.5 Other Freely Available awk Implementations". GAWK: Effective AWK Programming: A User's Guide for GNU Awk.
Further reading
[edit]- Andy Oram (May 19, 2021). "Awk: The Power and Promise of a 40-Year-Old Language". Fosslife. Retrieved June 9, 2021.
- Hamilton, Naomi (May 30, 2008). "The A-Z of Programming Languages: AWK". Computerworld. Retrieved 2008-12-12. – Interview with Alfred V. Aho on AWK
- Robbins, Daniel (2000-12-01). "Awk by example, Part 1: An intro to the great language with the strange name". Common threads. IBM DeveloperWorks. Retrieved 2009-04-16.
- Robbins, Daniel (2001-01-01). "Awk by example, Part 2: Records, loops, and arrays". Common threads. IBM DeveloperWorks. Retrieved 2009-04-16.
- Robbins, Daniel (2001-04-01). "Awk by example, Part 3: String functions and ... checkbooks?". Common threads. IBM DeveloperWorks. Archived from the original on 19 May 2009. Retrieved 2009-04-16.
- AWK – Become an expert in 60 minutes
- The Single UNIX Specification, Version 4 from The Open Group : pattern scanning and processing language – Shell and Utilities Reference,
- Linux User Manual – User Commands –
External links
[edit]- The Amazing Awk Assembler by Henry Spencer.
- "AWK (formerly) at Curlie". Curlie. Archived from the original on 2022-03-18.
- awklang.org The site for things related to the awk language
- 1977 software
- Cross-platform software
- Domain-specific programming languages
- Free and open source interpreters
- Pattern matching programming languages
- Plan 9 commands
- Programming languages created in 1977
- Scripting languages
- Standard Unix programs
- Text-oriented programming languages
- Unix SUS2008 utilities
- Unix text processing utilities