rearrange pages of ps file to be printed as booklet (duplex);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Admin/psbooklet	Thu Jun 26 11:14:46 1997 +0200
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+psbook "$@" | \
+  pstops '4:0L@.7(21cm,0cm)+1L@.7(21cm,14.85cm),3R@.7(0cm,14.85cm)+2R@.7(0cm,29.7cm)'