if( $ssh2->connect($host) ) {
    if( $ssh2->auth_password($user,$pass) ) {

        #shell use
        my $chan = $ssh2->channel();
        $chan->blocking(0);
        $chan->shell();

        $chan->write("ls -a\n");
        select(undef,undef,undef,0.2);
        print $buf while defined ($len = $chan->read($buf,512));

        $chan->write("who\n");
        select(undef,undef,undef,0.2);
        print $buf while defined ($len = $chan->read($buf,512));

        $chan->close;
    }
    else {
        warn "auth failed.\n";
    }
}