使用shell建立一個簡單的菜單bash select用法

概述

寫腳本的時候會碰到建立交互式菜單的狀況，好比碰到寫一個lnmp一鍵安裝腳本的時候會讓用戶選擇安裝mysql的版本或者選擇安裝各類組件，總之在建立菜單是很常見的。

而select是bash的一種擴展應用，讓用戶能夠在一組不一樣的值中選擇，相似下面

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

以後你就輸入前面的菜單選擇就是了

實例代碼

#!/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

上面要注意幾個地方，select這個循環內容裏面包含的是選擇以後要執行的東西REPLY這個變量就是你選擇的菜單的號碼，其實不難，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

執行結果

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會報錯，好比zsh ./test.sh: 9: ./test.sh: select: not found

其實只要指定shell去執行就能夠

bash + 要執行的腳本

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