编写脚本，实现如下功能：
如果该参数是“start"输出"start..."
如果该参数是“stop"输出"stop..."
如果该参数是“restart"输出"restart..."
否则提示错误

#!/bin/bash
DATE=`date +%Y%m%d`
A=$1
if [ "$A" = "start" ]; then
        echo "start..."
elif [ "$A" = "stop" ]; then
        echo "stop..."
elif [ "$A" = "restart" ]; then
        echo "restart..."
else
        echo "err"
fi

试试看

#!/bin/sh
case $1 in
"start")   echo "start..."
;;
"stop")   echo "stop..."
;;
"restart")   echo "restart..."
;;
*)   echo "error..."
;;
esac