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which.md

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which

which command is a simple command used to locate commands executables on the system.

which takes names of the commands as arguments and returns the pathnames of the files (or links) which would be executed in the current environment if those commands were run. It does this by searching the PATH for executable files matching the names of the passed arguments (it does not follow symbolic links).

For example, let's find the executable of the date command:

$ which date
/bin/date

The output shows that if we were to run date command, the /bin/date executable file would be run:

$ date
Sat Sep 22 04:57:14 UTC 2018
$ /bin/date
Sat Sep 22 04:57:18 UTC 2018

Resources used to create this document:

  • man which