Case commands in the shell

The case statement and the judgment statement [If...elif...else] function similarly;
When logic is relatively simple, the code is much less than the latter.
Case usage, use a variable to match a value, if the match succeeds, execute the command below it until;; so far.

#!/bin/bash #a =20 #定义变量值case $a in         #若变量在下面的某值中, execute the command below    )         #值内容 can add |, can have multiple values {    echo "The A is"         #执行输出命令    echo "Over"         #执行输出命令};;         #注意这是两个; |30)         #值内容 can be added with |, there can be multiple values {    echo "The A is" #执行输出命令    echo "over" #执行输出命令};; *)         #默认匹配内容, if none of the above matches, execute this echo "Hello" #执行输出内容;; ESAC         #结束echo "test Case End"         

　　

Case commands in the shell