$>      The effective uid of this process.  Example:

                  $< = $>;  # set real uid to the effective uid
                  ($<,$>) = ($>,$<);  # swap real and effective uid

             (Mnemonic: it's the uid you went TO, if you're  run-
             ning  setuid.)   Note: $< and $> can only be swapped
             on machines supporting setreuid().