sh -x htb.sh 
++ which modprobe
+ MODPROBE=/sbin/modprobe
+ /sbin/modprobe sch_htb
+ /sbin/modprobe sch_sfq
+ /sbin/modprobe cls_u32
+ tc qdisc del dev eth0 root
+ tc qdisc add dev eth0 root handle 1: htb default 50
+ tc class add dev eth0 parent 1: classid 1:1 htb rate 512kbit
+ tc class add dev eth0 parent 1:1 classid 1:10 htb rate 272kbit ceil 512kbit
+ tc class add dev eth0 parent 1:1 classid 1:20 htb rate 128kbit ceil 512kbit
+ tc class add dev eth0 parent 1:1 classid 1:30 htb rate 64kbit ceil 512kbit
+ tc class add dev eth0 parent 1:1 classid 1:40 htb rate 32kbit
+ tc class add dev eth0 parent 1:1 classid 1:50 htb rate 16kbit ceil 512kbit
+ tc qdisc add dev eth0 parent 1:10 handle 10: sfq perturb 10
+ tc qdisc add dev eth0 parent 1:20 handle 20: sfq perturb 10
+ tc qdisc add dev eth0 parent 1:30 handle 30: sfq perturb 10
+ tc qdisc add dev eth0 parent 1:40 handle 40: sfq perturb 10
+ tc qdisc add dev eth0 parent 1:50 handle 50: sfq perturb 10
+ U32='tc filter add dev eth0 parent 1:0 protocol ip prio 1 u32 '
+ U32='tc filter add dev eth0 parent 1:0 protocol ip prio 1 u32 match ip src 192.168.0.12'
+ tc filter add dev eth0 parent 1:0 protocol ip prio 1 u32 match ip src 192.168.0.12 match ip sport 80 0xffff flowid 1:40