一般建议变量用引号括起来
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case
shift
把刚才的变量踢掉
一、case语句：语法结构
case stitch in
value1)
statement
...
;;
value2)
statement
...
;;
*)
;;
esac
示例（给出选项让用户选择，然后根据用户所选显示出相应的信息）：
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[root@lovelace case]# cat showmenu.sh
#!/bin/bash#Version:0.1#Auther:lovelace#pragram:show menu and wait user choice##difine an function to display the menushowmenu(){echo -n '+----------'
echo -n -e "\033[1;32mshowmenu\033[0m"
echo '-----------+'
echo -e "| \033[31md|D) show disk information\033[0m |"
echo -e "| \033[31mm|M) show memory usage\033[0m |"
echo -e "| \033[31ms|S) show swap usage\033[0m |"
echo -e "| \033[31mq|Q) quitting\033[0m |"
echo -n '+-------------'
echo -n -e "\033[5,33mEND\033[0m"
echo '--------------+'
}#call showmenu functionechoshowmenuecho#read the argument for user inputread -p "Your choice is:" choice
#use while statement to loopwhile [ "$choice" != "q" -o "$choice" != "Q" ];do
#jugement the choice values and dispaly the resultcase $choice in
d|D)echo "Disk information:"
df -h
;;m|M)echo "Memory information:"
free -m | grep "Mem"
;;s|S)echo "Swap information:"
free -m | grep "Swap"
;;q|Q)echo "quitting...."
exit 8
;;*)echo "Unknow argument."
;;esac#call showmenu function againechoshowmenu#read user input againechoread -p "Please select again:" choice
done |
后记：这个好像就只是提了下case的语法结构，case在进行条件判断的时候相对于if来讲，个人更直观一些，不管怎么讲，脚本注重的是实现的目的，而不是过程，所以不管黑猫白猫，只要能抓住老鼠，就是好猫。
本文转自lovelace521 51CTO博客，原文链接：http://blog.51cto.com/lovelace/1211898，如需转载请自行联系原作者