coreutils: arch invocation

 
 21.2 ‘arch’: Print machine hardware name
 ========================================
 
 ‘arch’ prints the machine hardware name, and is equivalent to ‘uname
 -m’.  Synopsis:
 
      arch [OPTION]
 
    The program accepts the ⇒Common options only.
 
    ‘arch’ is not installed by default, so portable scripts should not
 rely on its existence.
 
    An exit status of zero indicates success, and a nonzero value
 indicates failure.