NAME
  which - locate a command

SYNOPSIS
  which COMMAND

DESCRIPTION
  This program writes the full path to each of the specified programs to the standard output. If a program is an alias, this is indicated. If a program cannot be found and error message will be written.

EXAMPLES
  which ls
    Displays `/bin/ls.lua`.

  which doesntexist dir
    Displays `doesntexist: file not found` and `dir: aliased to ls`.