which (1) Linux Manual Page

which – locate a command

Synopsis

which [-a] filename …

Description

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.

Options

-a

print all matching pathnames of each argument

Exit Status

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