The following chunk facilitates default values for command-line arguments.   It works fine, but I suspect there's a less redundant approach than just repeating "if defined($opt_foo){$foo=$opt_foo} else {$foo=def_val}" for seven different values of "foo".   I'd use hash keys and values, but there are three unique parameters for each iteration.

Suggestions, o wise brethren and sistren? 

#!/usr/bin/perl -w

use strict;
use Getopt::Long

my (
  $targ,       $opt_targ,
  $firstport,  $opt_firstport,
  $lastport,   $opt_lastport,
  $proto,      $opt_proto,
  $udptimeout, $opt_udptimeout,
  $contimeout, $opt_contimeout,
  $help,
);

GetOptions(
  'targ=s'       => \$opt_targ,
  'firstport=s'  => \$opt_firstport,
  'lastport=s'   => \$opt_lastport,
  'proto=s'      => \$opt_proto,
  'udptimeout=s' => \$opt_udptimeout,
  'contimeout=s' => \$opt_contimeout,
  'help!'        => \$opt_help,
);
if (defined $opt_targ){ $targ = $opt_targ }
  else {$targ='localhost';}

if (defined $opt_firstport){ $firstport = $opt_firstport }
  else {$firstport=1;}

if (defined $opt_lastport){ $lastport = $opt_lastport }
  else {$lastport=1024;}

if (defined $opt_proto){ $proto = $opt_proto}
  else {$proto='tcp';}

if (defined $opt_udptimeout){ $udptimeout = $opt_udptimeout }
  else {$udptimeout=3;}

if (defined $opt_contimeout){ $contimeout = $opt_contimeout }
  else {$contimeout=3;}

if (defined $opt_help){
  Usage('You rang, sir?');
  exit;
}

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    cheers,
    Don
    striving toward Perl Adept
    (it's pronounced "why-bick")

In reply to Reduce Redundant Repetition by ybiC

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