I just used this program to make a change to the XEmacs sources, and I thought people might be interested: : #-*- Perl -*- # Copyright (C) 1999 Martin Buchholz # This program is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the # Free Software Foundation; either version 2, or (at your option) any # later version. # # This program is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License # for more details. # # You should have received a copy of the GNU General Public License # along with XEmacs; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA. eval 'exec perl -w -S $0 ${1+"$＠"}' if 0; use strict; use FileHandle; use Carp; (my $myName = $0) =~ s＠.*/＠＠; my $usage=" Usage: $myName PERLEXPR FILE... Typical usage is like this: find . -name '*.[ch]' -print | xargs $0 's/\bCONST\b/const/g'\n"; die $usage unless ＠ARGV > 1; my $code = shift; die $usage if grep (-d || ! -w, ＠ARGV); sub SafeOpen { open ((my $fh = new FileHandle), $_[0]); confess "Can't open $_[0]: $!" if ! defined $fh; return $fh; } sub WriteStringToFile { my $fh = SafeOpen ("> $_[0]"); print $fh $_[1] or confess "$_[0]: $!\n"; close $fh or confess "$_[0]: $!\n"; } foreach my $file (＠ARGV) { my $changed_p = 0; my $fh = SafeOpen $file; my $new_contents = ""; while (<$fh>) { my $save_line = $_; eval $code; $changed_p = 1 if $save_line ne $_; $new_contents .= $_; } WriteStringToFile ($file, $new_contents) if $changed_p; }