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Little tricks

How do I change several files at the same time by toolkit
Posted: 5 Aug 01

For example, you wish to recursively modify all HTML files. There are two approaches:

In UNIX you can use the following one-liner from the shell:

find docs -type f -name "*.html" | xargs perl -i -p -e 's/foo/bar/g'

Alternatively, you can use the File::Find package:

use File::Find;

sub change {

    if( -f && /\.html$/ ) {

        my $in  = $_;
        my $out = "$in.$$";

        open( IN, $in ) or die;
        open( OUT, ">$out" ) or die;

        while( <IN> ) {
            print OUT;

        close IN;
        close OUT;

        rename( $out, $in );

my @dirs = qw( docs );

find ( \&change, @dirs );

Happy coding, Cheers NEIL

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