Process command line parameters, use modules

---

• scalar reference
• perl process_command_line.pl --color blue

examples/perlarrays/process_command_line.pl

#!/usr/bin/perl
use strict;
use warnings;

use Getopt::Long qw(GetOptions);

my $color;
GetOptions("color=s" => \$color) or die "Usage: $0 [--color COLOR]\n";

if (not defined $color) {
    my @colors = ("Blue", "Yellow", "Brown", "White");
    print "Please select a number:\n";
    foreach my $i (0..$#colors) {
        print "$i) $colors[$i]\n";
    }
    my $num = <STDIN>;
    chomp($num);
    if (defined $colors[$num]) {
        $color = $colors[$num];
    } else {
        print "Bad selection\n";
        exit;
    }
}

print "The selected color is $color\n";