shellLinux shell 之 case 详解

Posted 2020-10-28

总的来说，case是一个判断语句 ，比if更加容易理解一点。

case 语句格式

case in 变量 
值1)
    内容 ;;
值2)
    内容 ;;
esac

注意：每个内容后面都需要添加 ;; ，可以跨行也可以同行写。

实例：根据用户输入的选择执行语句。

#!/bin/bash -
# 打印选择菜单
cat <<EOF
        Option:
        1) restart networking service.
        2) start networking service.
        3) stop networking service.
        *) exit.
EOF
read -p "Please enter a option:" number

# 使用case语句对参数进行判断
case $number in
1)
        echo "The Networking service is restart,wait......" ;;
2)
        echo "The Networking service is start,wait......" ;;
3)
        echo "The Networking service is stop,wait......" ;;
*)
        echo "exit."  ;;
esac

[[email protected] scripts]# bash case.sh
Option:
1) restart networking service.
2) start networking service.
3) stop networking service.
*) exit.
Please enter a option:1
The Networking service is restart,wait......

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