For when sloppy coders can't keep their case straight. I never believed this possible, but after contracting with a firm who's name I will not mention for a team, I got back about 200 json files with randomly capitalized names. Despite being very clear we were deploying to an apache2 server on Linux, they tested on their case-insensitive Windows…

lowercase_filenames.pl

#!/usr/bin/perl -w

opendir DIR, ".";
my @files = grep { $_ ne '.' && $_ ne '..' } readdir DIR;
closedir DIR;

for $file (@files) {
	my $lfile = lc($file);
	if ($lfile ne $file) {
		print $file . "\n";
		`svn mv $file $lfile`;
	}
}