use strict;
use File::Find ();

# Set the variable $File::Find::dont_use_nlink if you're using AFS,
# since AFS cheats.

# for the convenience of &wanted calls, including -eval statements:
use vars qw/*name *dir *prune/;
*name   = *File::Find::name;
*dir    = *File::Find::dir;
*prune  = *File::Find::prune;

sub wanted;



# Traverse desired filesystems
File::Find::find({wanted => \&wanted}, '.');
exit;


sub wanted {
    my ($dev,$ino,$mode,$nlink,$uid,$gid);


    (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
    print("$name\n");
}

sub wanted {
    
    local @ARGV = $_;
    local $^I   = '';

    while( <> ) {
        s/_THIS_/_THAT_/g;
        print;
    }
}

perl -i -pe 's/_THIS_/_THAT_/g' *