goagent toggle

#说明
#1. [ -z "$1" ]             判断字符串是否为空
#2. [ $1 == "off" ] && foo  简化的if写法 
#3. nohup foo &             让程序在后台运行
#4. xargs                   让管道的输出作为args （正常情况管道的输出是作为标准输入）

function goagent() {
        if [ -z "$1" ] ; then
                echo "Args too few"
                echo "e.g. goagent on"
        else
                [ $1 == "on" ] && nohup python /path/to/goagent/local/proxy.py &
                [ $1 == "off" ] && ps | grep python | awk 'NR==1{print $4}' | xargs killall $1
        fi
}