my $command1 = <STDIN>; chomp($command1);
my ($command2, $command3) = ('default', 'hoo hah');
unless (eof(STDIN)) {
    $command2 = <STDIN>; chomp $command2;

    unless (eof(STDIN)) {
        $command3 = <STDIN>; chomp $command3;
    }
}