Linux上case用法

Linux上case⽤法⽰例：

#!/bin/bash

# This is a script for test case

ASK_COUNT=$1 #从参数获取该变量的值#

if [ -z \"$ASK_COUNT\" ] #判断ASK_COUNT变量是否为空,为空输出1,不为空输出2then

echo \"1\"else

echo \"2\"fi

echo \"ASK_COUNT:$ASK_COUNT\"case $ASK_COUNT in2)

echo

echo \"Please answer the question.\" echo;;3)

echo

echo \"One last try... Please answer the question.\" echo;;4)

echo

echo \"Since you refuse to answer the question...\" echo # exit;;

esac　　# shell 的风格，⽤倒序的字母单词和 正序的单词配对。⽐如 if 语句， 结束时⽤ fi 来配对#

⽤法：

[keysystem@localhost 20180202]$ sh case_test.sh 22

ASK_COUNT:2

Please answer the question.

[keysystem@localhost 20180202]$ sh case_test.sh 32

ASK_COUNT:3

One last try... Please answer the question.[keysystem@localhost 20180202]$