NAME
which - locate a command
SYNOPSIS
which [-a] filename ...
DESCRIPTION
which
returns the pathnames of the files 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.
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
