Avoid external programs

Rather than worry about how external program interaction works, it's best to avoid it entirely.

  # Why use /bin/rm, when perl already has
  # that ability built in?

  unlink <*>;

or better yet

  # Do them one at a time, so we can show failures.
  for ( <*> ) {
      unlink $_ or print "Unable to unlink $_\n"
  }