我怎样才能删除 htb 中的一个队列？

Question

如果 htb 中有两个队列，我想删除其中一个。我的脚本如下：

TC=/sbin/tc
IF=wlan0            # Interface 
DNLD=1mbit          # DOWNLOAD Limit
UPLD=1mbit          # UPLOAD Limit 
IP1="myIPset1"      # Host IP
IP2="myIPset2"
U32="$TC filter add dev $IF protocol ip parent 1:0 prio 1 u32"

start() {
    $TC qdisc add dev $IF root handle 1: htb default 30
    $TC class add dev $IF parent 1: classid 1:1 htb rate $DNLD
    $TC class add dev $IF parent 1: classid 1:2 htb rate $UPLD
    $TC filter add dev $IF parent 1: prio 1 protocol ip u32 match ip src $IP1 flowid 1:1
    $TC filter add dev $IF parent 1: prio 1 protocol ip u32 match ip src $IP2 flowid 1:2

    # Add impairments with netem
    $TC qdisc add dev $IF parent 1:1 handle 1: netem delay 100ms
}

stop() {
    $TC qdisc del dev $IF root
}

restart() {
    stop
    sleep 1
    start
    }

show() {
    $TC -s qdisc ls dev $IF
    }
case "$1" in
  start)
        echo -n "Starting bandwidth shaping: "
    start
    echo "done"
    ;;

  stop)
    echo -n "Stopping bandwidth shaping: "
    stop
    echo "done"
    ;;

  restart)
        echo -n "Restarting bandwidth shaping: "
    restart
    echo "done"
    ;;
  show)
        echo "Bandwidth shaping status for $IF:\n"
    show
    echo ""
    ;;
  *)
        pwd=$(pwd)
    echo "Usage: $(/usr/bin/dirname $pwd)/tc.bash {start|stop|restart|show}"
    ;;

esac
exit 0

然而，我没有找到删除一个队列的方法，而是删除所有队列。我怎么才能删除 1:1 队列呢？