[Perl] Bookmaker 1.1

!/usr/bin/perl -sw
##
##              it converts a postscript file to a book format with two pages
##              of text on each side of an A4 sheet. the sheets fold and bind 
##              into a book of same form-factor as most trade paperbacks.
##
## syntax: makeabook -book=file.ps
##
## Copyright (c), Vipul Ved Prakash.  All rights reserved.
## This code is free software; you can redistribute it and/or modify
## it under the same terms as Perl itself.
## modded by fred777, bugs fixxed
##
## $Id$


die unless $book; 
my $filename = $book; 
$book =~ s/\.ps$//i;


print  "realigning pages...\n";
system "psbook -s4 $filename > $book-tempA.ps";


print  "\nmerging pages...\n";
system "psnup -2 $book-tempA.ps > $book-tempB.ps";
system "rm $book-tempA.ps";


print  "\nwriting front sides...\n";
system "psselect -o $book-tempB.ps > $book-FRONT.ps";


print  "\nwriting back sides...\n";
system "psselect -e $book-tempB.ps > $book-BACK.ps";
system "rm $book-tempB.ps";