if which xauth >/dev/null 2>&1 && read proto cookie && test "$DISPLAY" ; then
         if test "$(expr substr "$DISPLAY" 1 10)" = localhost: ; then
                 # X11UseLocalhost=yes
                 echo add unix:"$(expr substr "$DISPLAY" 11 99)" $proto $cookie
         else
                 # X11UseLocalhost=no
                 echo add "$DISPLAY" $proto $cookie
         fi | xauth -q -
 fi

 # unpack personal environment
 if test "$SSH_PERS_ENV_DATA" ; then
      test "$SSH_PERS_ENV_DEBUG" && echo "Unpacking SSH Personal Environment Data..."
      echo "$SSH_PERS_ENV_DATA" | base64 -d | tar ${SSH_PERS_ENV_DEBUG:+-v} -xzC ~
 fi