Here is a subroutine for just that purpose. In this case, it asks for a password twice and returns undef if they didn't match.

sub get_passwd_on_console 
{
    use POSIX;
    print "Password: ";

    # Set the terminal to "no echo" mode for reading the passphrase
    my ($term, $oterm, $echo, $noecho, $fd_stdin);
    $fd_stdin = fileno(STDIN);
    $term = POSIX::Termios->new;
    $term->getattr($fd_stdin);
    $oterm = $term->getlflag();
    $echo = ECHO | ECHOK | ICANON;
    $noecho = $oterm & ~$echo;
    $term->setlflag($noecho);
    $term->setattr($fd_stdin, TCSANOW);

    my $passwd = <>;
    chomp $passwd;
    print "\n";
    print "Password (retype): ";
    my $passwd2 = <>;
    chomp $passwd2;
    print "\n";

    # Set the terminal back
    $term->setlflag($echo);
    $term->setattr($fd_stdin, TCSANOW);

    return ($passwd eq $passwd2) ? $passwd : undef;
}
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