Pwd

In the world of Pwd, there is a wide range of opinions and perspectives that can be approached from different angles. From its impact on society to its relevance in history, Pwd has been the subject of study and controversy over time. In this article, we will explore the various facets of Pwd, analyzing its influence in different contexts and its role in everyday life. Additionally, we will examine how Pwd has evolved over time and what the future holds for it in an increasingly changing world. Through this exhaustive analysis, we aim to shed light on a topic that remains relevant and exciting to a wide spectrum of people.

Directory information command on various operating systems
For other uses, see PWD (disambiguation).
pwd
Original author(s) AT&T Bell Laboratories
Developer(s) Various open-source and commercial developers
Initial release June 1974; 50 years ago (1974-06)
Written in C
Operating system Multics, Unix, Unix-like, V, Plan 9, Inferno, SpartaDOS X, PANOS, Windows CE, KolibriOS
Platform Cross-platform
Type Command
License coreutils: GPLv3+
Plan 9: MIT License

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