Here, including my own stuff are my top 20 according to useage---

• 0010, Carp::Assert
• 0011, XML::Twig
• 0012, Chess::PGN::Moves
• 0013, Carp
• 0013, Wild
• 0016, Chess::PGN::Filter
• 0016, Getopt::Std
• 0017, Parse::RecDescent
• 0018, File::Basename
• 0021, DB_File
• 0021, Pod::Usage
• 0022, Text::Wrap
• 0023, Getopt::Long
• 0027, Text::DelimMatch
• 0032, Text::CSV
• 0039, Chess::PGN::Parse
• 0045, Test
• 0046, ExtUtils::MakeMaker
• 0048, Data::Dumper
• 0062, Chess::PGN::EPD
• 0068, constant
• 0223, diagnostics
• 0223, warnings
• 0239, strict

How do I know this? Fairly easy, go to the root of your Perl development tree on the box of your choice and append the results of 'grep -rd "^use " *.pl' to this:

#!/perl/bin/perl
#
# use.pl -- statistics for 'use' module name.
use strict;
use warnings;
use diagnostics;

my %module;
my @list;

while (<DATA>) {
    if (/^use\s(.*?);/) {
        my $what = $1;
        if ($what =~ /^lib/) {
            $module{'lib'}++;
        }
        elsif ($what =~ /^constant/) {
            $module{'constant'}++;
        }
        else {
            $module{$what}++;
        }
    }
}
for (keys %module) {
    push(@list,sprintf("%04d|%s",$module{$_},$_));
}
for (sort @list) {
    my($howmany,$what) = split /\|/;
    print "$howmany, $what\n";
}
__DATA__
[download]

And then run the script...

--hsm

"Never try to teach a pig to sing...it wastes your time and it annoys the pig."

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