Linux Shell 判断语句

• 最近想用一个脚本，执行几种功能，只需要将一个变量修改一下即可

• 源码如下：

    MODE="4G"

    start() {
        if [ ${MODE} == "4G" ]
        then
            echo 4g
        elif [ ${MODE} == "2G" ]
        then
            echo 2g nb-iot
        elif [ ${MODE} == "WIFI" ]
        then
            echo wifi
        else
            echo "No such Mobile mode...\n"
        fi
        echo "Mobile Network ${MODE} start ... "
    }