which

name

       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 follow symbolic links.

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