#!/bin/bash##  tc uses the following units when passed as a parameter.#  kbps: Kilobytes per second #  mbps: Megabytes per second#  kbit: Kilobits per second#  mbit: Megabits per second#  bps: Bytes per second #       Amounts of data can be specified in:#       kb or k: Kilobytes#       mb or m: Megabytes#       mbit: Megabits#       kbit: Kilobits#  To get the byte figure from bits, divide the number by 8 bit#TC=/sbin/tcIF=eth0            # Interface DNLD=1mbit          # DOWNLOAD LimitUPLD=1mbit          # UPLOAD Limit IP=216.3.128.12     # Host IPU32="$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    $U32 match ip dst $IP/32 flowid 1:1    $U32 match ip src $IP/32 flowid 1:2}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}"    ;;esacexit 0