Shell脚本之case语句

• 没有对比，就没有伤害，先来看一下使用else if有多麻烦

[root@foundation8 test]# cat if_complex.sh 
#!/bin/bash
#looking for a possible value
if [ $USER = "student" ];then
echo "Welcome $USER"
echo "Please enjoy your visiting!"
elif [ $USER = "Bob" ];then
echo "Welcome $USER"
echo "Please enjoy your visiting!"
elif [ $USER = "Alice" ];then
echo "Welcome $USER"
echo "Please enjoy your visiting!"
elif [ $USER = "Coco" ];then
echo "Welcome $USER"
echo "Please enjoy your visiting!"
else
echo "Sorry,you're not allowed here."
fi
[root@foundation8 test]# sh if_complex.sh 
Sorry,you're not allowed here.

• case闪亮登场

[root@foundation8 test]# cat case_better.sh 
#!/bin/bash
#using the case command
case $USER in
student|Bob|Alice|Coco)
echo "Welcome $USER"
echo "Please enjoy your visiting!"
;;
*)
echo "Sorry,you're not allowed here."
esac
[root@foundation8 test]# sh case_better.sh 
Sorry,you're not allowed here.

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