set proxy on Mac using command

set-proxy

#!/bin/bash
USAGE="usage:set-proxy {eth|wifi} {socks|http|auto} {on|off|set} [addr] [port]"
if [[ $# -lt 3 ]]; then
    echo ${USAGE}
    exit 1
fi

INTERFACE=""
case $1 in
    eth|tbt-eth)
        INTERFACE="tbt-eth"
    ;;
    wifi|wi-fi|Wi-Fi)
        INTERFACE="Wi-Fi"
    ;;
    *)
        echo ${USAGE}
        exit 1
    ;;
esac

TYPE=""
PARAM_COUNT=5
case $2 in
    socks)
        TYPE="socksfirewallproxy"
    ;;
    http)
        TYPE="webproxy"
    ;;
    auto)
        TYPE="autoproxy"
        PARAM_COUNT=4
    ;;
    *)
        echo ${USAGE}
        exit 1
    ;;
esac

case $3 in
    on|off)
        sudo networksetup -set${TYPE}state ${INTERFACE} $3
    ;;
    set)
        if [[ $# -lt $PARAM_COUNT ]]; then
            echo "param not enough"
            exit 1
        fi
        if [[ "$2" = "auto" ]]; then
            sudo networksetup -set${TYPE}url ${INTERFACE} $4
        else
            sudo networksetup -set${TYPE} ${INTERFACE} $4 $5 off
        fi
    ;;
    *)
        echo ${USAGE}
        exit 1
    ;;
esac

if [[ "$2" = "auto" ]]; then
    networksetup -get${TYPE}url ${INTERFACE}
else
    networksetup -get${TYPE} ${INTERFACE}
fi

exit 0