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my ($command1, $command2, $command3) = @ARGV;
$command2 = 'default' unless defined $command2;
...
my $command1 = shift or die; # Ideally call a subroutine to print usag
+e and die
my $command2 = shift || 'default';
my $command3 = shift || 'hoo hah';

my $command1 = <STDIN>; chomp($command1);
my ($command2, $command3) = ('default', 'hoo hah');
...
        $command3 = <STDIN>; chomp $command3;
    }
}