#!/usr/bin/perl --
use strict;
use warnings;
use Getopt::Long qw/ GetOptions /;
use Data::Dump qw/ dd /;
Main( @ARGV );
exit( 0 );
sub Main {
    my %opts;
    GetOptions(
        \%opts,
        'carriers|c|C=s',
        'num_tp|t|T|TP=i',
        'Help|h|H',
        'bs|b|B|BS|bs', 
        'version|v|V',
        'legend|l|L=s', 
        'altitude|a|A=i',
        'actdir|d|D=s',
    );
    dd( \%opts );
    WorkTheWorkbook( \%opts );
}
sub WorkTheWorkbook {
    my( $optsRef ) = @_;
    dd( $optsRef );
    print "altitude=$optsRef->{altitude}\n";
    use autodie qw/ open close /;
    open my($fh), '<', '$optsRef->{altitude}'; # fake
    return;
}
__END__
$ perl moresubs1184355-002.pl -c=1 -t=2  -v=3 -h=4 -l=5  -a=6 -d=7
Option v does not take an argument
Option h does not take an argument
{ actdir => 7, altitude => 6, carriers => 1, legend => 5, num_tp => 2 }
{ actdir => 7, altitude => 6, carriers => 1, legend => 5, num_tp => 2 }
altitude=6
Can't open '$optsRef->{altitude}' for reading: 'Invalid argument' at moresubs1184355-002.pl line 29