# Call this system's shell, returns TRUE on 0 exit code
   # THIS IS THE OPPOSITE SENSE OF system()'s RETURN VALUE
      run "cat a b c" or die "cat returned $?";

   # Launch a sub process directly, no shell.  Can't do redirection
   # with this form, it's here to behave like system() with an
   # inverted result.
      $r = run "cat a b c";