B::Xref is recommended in some of the nodes that planetscape listed. B::Xref generates a cross reference listing of all definitions and uses of variables, subroutines and formats in a Perl program. Here is loosely tested code that uses B::Xref to detect unreferenced subroutines: 

use strict;
use warnings;

my $script_name = shift or die;
my @lines = `perl -MO=Xref,-r $script_name` or die;

my %used_subs;
my %defined_subs;
foreach (@lines) {
  my ($file, $subr, $line, $package, $type, $object, $event) = split;
  next if $file    ne $script_name
       or $type    ne '&'
       or $package ne 'main';

  if ( $event eq 'subdef' ) {
     $defined_subs{$object} = 1;
  }
  elsif ( $event eq 'subused' ) {
    $used_subs{$object} = 1;
  }
}

foreach my $key ( sort keys %defined_subs ) {
    next if $used_subs{$key};
    print "Sub not directly called: '$key'\n";
}

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In reply to Re: Write Coding to validate the .pl Files by Util
in thread Write Coding to validate the .pl Files by kanish

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