which (Unix)

which is a Unix command used to identify the location of executables.

The command takes one or more arguments; for each of these arguments, it prints the full path of the executable to stdout that would have been executed if this argument had been entered into the shell. It does this by searching for an executable or script in the directories listed in the environment variable PATH.^[1] The which command is part of most Unix-like computers. It is also part of the C Shell,^[2] and is available as a separate package for Microsoft Windows^[3] or use the similar where.exe. The same functionality is available in MS-DOS, but not Windows, as the built-in TRUENAME command.

The functionality of the which command is similar to some implementations of the type command. POSIX specifies a command named command that also covers this functionality.^[2]

References

↑ which man page
1 2 "Command", The Open group base specification, Issue 7, IEEE std 1003.1-2008
↑ which for Windows from the GnuWin32 project

External links

GNU Which official page

Unix command-line interface programs and shell builtins

File system	cat chmod chown chgrp cksum cmp cp dd du df file fsck fuser ln ls mkdir mount mv pax pwd rm rmdir split tee touch type umask

Processes	at bg chroot cron fg kill killall nice pgrep pkill ps pstree time top

User environment	clear env exit finger history logname mesg passwd su sudo uptime talk tput uname w wall who whoami write

Text processing	awk banner basename comm csplit cut diff dirname ed ex fmt fold head iconv join less more nl paste printf sed sort spell strings tail tr uniq vi wc xargs yes

Shell builtins	alias cd echo test unset wait

Networking	dig host ifconfig inetd netcat netstat nslookup ping rdate rlogin route ssh traceroute

Searching	find grep locate whatis whereis

Documentation	apropos help man

Miscellaneous	bc dc cal expr lp od sleep true and false

List of Unix commands

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