This program takes one argument which is the directory to search (like c:\Devel). It then counts and adds up all the lines in every .pm or .pl file in that directory and then recursively in every subdirectory. Simple but useful. And I was pleased with my implementation. I run this on windows but it should work fine in Linux as well. 
use strict;

#counter for the number of lines we'll get
my $count = 0;

#first call our subroutine with program argument
count_dir($ARGV[0]);

#our recursive subroutine that counts .pl|.pm file-lines
sub count_dir($) {
    my ($dir) = @_;

    #try to open directory passed or return if fail
    unless (opendir(DIR, $dir)) {
        print "\tCouldn't open dir: $dir\n";
        return;
    }

    #get all files in directory
    my @files = readdir(DIR);

    #go through each file in dir
    foreach my $file (@files) {
        #move on if this file is a symbol
        next if (length($file) < 3);

        #if file is a .pl|.pm then count it's lines
        if ($file =~ /\.pl|\.pm/) {
            open(FILE, "<", "$dir\\$file")
                or print "\tCouldn't open $file to analyze\n";
            while (<FILE>) { $count++; }
        }

        #otherwise if we can make this a directory lets dive into it
        elsif (opendir(TDIR, "$dir\\$file")) {
            count_dir("$dir\\$file");
        }
    }
}

#print out our results
print "\nLines of Perl code in directory:\t$count\n";

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In reply to Perl LineCount by Fideist11

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