使用shell建立一个简单的菜单bash select用法

概述

写脚本的时候会碰到建立交互式菜单的状况，好比碰到写一个lnmp一键安装脚本的时候会让用户选择安装mysql的版本或者选择安装各类组件，总之在建立菜单是很常见的。

而select是bash的一种扩展应用，让用户能够在一组不一样的值中选择，相似下面

This is a menu Test
Please Choose what you want
1) bugger
2) linux:
#?

以后你就输入前面的菜单选择就是了

实例代码

#!/bin/bash

echo "Please select your favorite linux distribution"

linux_distributions="Ubutnu Fedora Centos Arch"

select linux_distribution in $linux_distributions:
do 
    echo "you selected $REPLY $linux_distribution"
done

上面要注意几个地方，select这个循环内容里面包含的是选择以后要执行的东西REPLY这个变量就是你选择的菜单的号码，其实不难，好比再好比下面

#!/bin/bash

ubuntu(){
    echo "This is ubuntu func"
}

fedora(){
    echo "This is fedora func"
}

centos(){
    echo "This is centos func"
}

arch(){
    echo "This is arch func"
}

echo "Please select your favorite linux distribution"

linux_distributions="Ubutnu Fedora Centos Arch"

select linux_distribution in $linux_distributions:
do 
    case $REPLY in
    1) ubuntu
    ;;
    2) fedora
    ;;
    3) centos
    ;;
    4) arch
    ;;
    *) echo "please choose 1-4"
    ;;
    esac
done

执行结果

Please select your favorite linux distribution
1) Ubutnu
2) Fedora
3) Centos
4) Arch:
#? 1
This is ubuntu func
#? 2
This is fedora func
#? 3
This is centos func
#? 4
This is arch func
#? 5
please choose 1-4
#? 6
please choose 1-4
#?

要注意的地方

select可能有的shell会报错，好比zsh ./test.sh: 9: ./test.sh: select: not found

其实只要指定shell去执行就能够

bash + 要执行的脚本

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