Jump to content

Pwd: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
Undid revision 1038490045 by Computers4people (talk) see Talk page
https://kidscreen.com/2021/10/07/zeptolab-preps-om-nom-preschool-spinoff/ Peckingdtktufydwetd,yughgtd gikytdd
Tags: Reverted Mobile edit Mobile web edit
Line 45: Line 45:
Note: POSIX requires that the default behavior be as if the <code>-L</code> switch were provided.
Note: POSIX requires that the default behavior be as if the <code>-L</code> switch were provided.


==Working directory shell variables==
$[]$"==Working directory shell variables==
POSIX shells set the following [[environment variable]]s while using the cd command:<ref>{{Cite web|url=https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html|title=cd|website=pubs.opengroup.org}}</ref>
POSIX shells set the following [[environment variable]]s while using the cd command:<ref>{{Cite web|url=https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html|title=cd|website=pubs.opengroup.org}}</ref>


Revision as of 09:54, 26 February 2022

For other uses, see PWD (disambiguation).
pwd
Original author(s)AT&T Bell Laboratories
Developer(s)Various open-source and commercial developers
Initial releaseJune 1974; 50 years ago (1974-06)
Operating systemMultics, Unix, Unix-like, V, Plan 9, Inferno, SpartaDOS X, PANOS, Windows CE, KolibriOS
PlatformCross-platform
TypeCommand
Licensecoreutils: GPLv3+

In Unix-like and some other operating systems, the pwd command (print working directory)[1][2][3] writes the full pathname of the current working directory to the standard output.[4][5][6][7][8][9][10]

Implementations

Multics had a pwd command (which was a short name of the print_wdir command)[11] from which the Unix pwd command originated.[12] The command is a shell builtin in most Unix shells such as Bourne shell, ash, bash, ksh, and zsh. It can be implemented easily with the POSIX C functions getcwd() or getwd().

It is also available in the operating systems SpartaDOS X,[13] PANOS,[14] and KolibriOS.[15] The equivalent on DOS (COMMAND.COM) and Microsoft Windows (cmd.exe) is the cd command with no arguments. Windows PowerShell provides the equivalent Get-Location cmdlet with the standard aliases gl and pwd. On Windows CE 5.0, the cmd.exe Command Processor Shell includes the pwd command.[16]

pwd as found on Unix systems is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the Single Unix Specification.[17] It appeared in Version 5 Unix.[18] The version of pwd bundled in GNU coreutils was written by Jim Meyering.[19]

The numerical computing environments MATLAB and GNU Octave include a pwd function with similar functionality.[20][21] The OpenVMS equivalent is show default.

*nix examples

Command Explanation
pwd Display the current working directory. Example: /home/foobar
pwd -P Display the current working directory physical path - without symbolic link name, if any. Example: If standing in a dir /home/symlinked, that is a symlink to /home/realdir, this would show /home/realdir
pwd -L Display the current working directory logical path - with symbolic link name, if any. Example: If standing in a dir /home/symlinked, that is a symlink to /home/realdir, this would show /home/symlinked

Note: POSIX requires that the default behavior be as if the -L switch were provided.

$[]$"==Working directory shell variables== POSIX shells set the following environment variables while using the cd command:[22]

OLDPWD
The previous working directory (as set by the cd command).
PWD
The current working directory (as set by the cd command).

See also

References

  1. ^ "pwd(1) [minix man page]". www.unix.com.
  2. ^ "pwd - print name of current/working directory - man page". www.mankier.com.
  3. ^ "GNU Coreutils". www.gnu.org.
  4. ^ Unix Time-Sharing System: Unix Programmer's Manual (PDF). Vol. 1 (7th ed.). Bell labs. January 1979. p. 142. Archived from the original (PDF) on 2005-05-20.
  5. ^ "pwd(1) [plan9 man page]". www.unix.com.
  6. ^ "pwd". pubs.opengroup.org.
  7. ^ "pwd(1) [osf1 man page]". www.unix.com.
  8. ^ "Apple OS X MAN page".
  9. ^ "pwd(1) - OpenBSD manual pages". man.openbsd.org.
  10. ^ "pwd(1) [opensolaris man page]". www.unix.com.
  11. ^ "working_dir, wd, print_wdir, pwd (Multics help segment)". MIT. Retrieved 7 March 2020.
  12. ^ Van Vleck, Tom. "Unix and Multics". Multicians.org. Retrieved 7 March 2020.
  13. ^ "SpartaDOS X 4.48 User Guide" (PDF).
  14. ^ "Chris's Acorns: Panos". chrisacorns.computinghistory.org.uk.
  15. ^ "Shell - KolibriOS wiki". wiki.kolibrios.org.
  16. ^ "Command Processor Commands (Windows CE 5.0)". docs.microsoft.com.
  17. ^ wc – Shell and Utilities Reference, The Single UNIX Specification, Version 4 from The Open Group
  18. ^ pwd(1) – FreeBSD General Commands Manual
  19. ^ pwd(1) – Linux User Manual – User Commands
  20. ^ "Identify current folder - MATLAB pwd". www.mathworks.com.
  21. ^ "Function Reference: pwd". octave.sourceforge.io.
  22. ^ "cd". pubs.opengroup.org.

Further reading

The Wikibook Guide to Unix has a page on the topic of: Commands
Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=Pwd&oldid=1074087803"