Linux Command Library
commands
Commands
basic
Basic
tips
Tips

which

locate a command

- Search the PATH environment variable and display the location of any matching executables:
which [executable]

- If there are multiple executables which match, display all:
which -a [executable]

which [-a] filename ...

which returns the pathnames of the files (or links) which would be executed in the current environment, had its arguments been given as commands in a strictly POSIX-conformant shell. It does this by searching the PATH for executable files matching the names of the arguments. It does not canonicalize path names.

-a
print all matching pathnames of each argument

0
if all specified commands are found and executable
1
if one or more specified commands is nonexistent or not executable
2
if an invalid option is specified

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