linux系统中case语句的用法

 

1、测试1

[root@centos7 test2]# cat test.sh
#!/bin/bash
read -p "please input an character: " i
case $i in
[a-z]|[A-Z])
echo "letter!"
;;
[0-9])
echo "number!"
;;
*)
echo "other!"
esac
[root@centos7 test2]# bash test.sh
please input an character: 9
number!
[root@centos7 test2]# bash test.sh
please input an character: d
letter!
[root@centos7 test2]# bash test.sh
please input an character: []
other!

 

2、测试2

[root@centos7 test2]# ls
test2.sh
[root@centos7 test2]# cat test2.sh
#!/bin/bash
read -p "please input yes or no: " anw
case $anw in
[yY][eE][sS]|[yY])
echo "yes"
;;
[nN][oO]|[nN])
echo "no"
;;
*)
echo "false."
esac
[root@centos7 test2]# bash test2.sh
please input yes or no: y
yes
[root@centos7 test2]# bash test2.sh
please input yes or no: no
no
[root@centos7 test2]# bash test2.sh
please input yes or no: 325
false.