if diff -u makes zero output, try diff -c instead

        print TEMP $_;

    }

    close(TEMP);

    my @out = `diff -u $file2 $file1`;

    my @out = `diff -u $file2 $file1 2>/dev/null`;

    if(!$out[0]) {

	@out = `diff -c $file2 $file1 2>/dev/null`;

    }

    return @out;

}