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All the Perl that's Practical to Extract and Report

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  • At first glance, it looks like you're trying merge lines from a file with filenames passed on the command line. Why? Heck if I know. If your line appears after a file has been read, $. will be >= 1, so $ARGV[0] might be the name of the file containing lines you're reading (since that name wouldn't print).

    open(IN, $ARGV[0]) or die "$ARGV[0]: $!";
    while ( <IN> ) {
        print "$ARGV[$.] $_\n";

    What I'm pondering while looking at this, and without virtue of perlvar, is whether there's some other way that $. is side-effected.