常用shell命令参数（高级）
http://blog.51cto.com/images/editer/InBlock.gif#!/bin/shhttp://blog.51cto.com/images/editer/InBlock.gifecho "请选择:"http://blog.51cto.com/images/editer/InBlock.gifxx="你好 大家好 退出"
http://blog.51cto.com/images/editer/InBlock.gifselect a in $xx;do
http://blog.51cto.com/images/editer/InBlock.gifif [ "$a" = "你好" ];then
http://blog.51cto.com/images/editer/InBlock.gifecho 你好
http://blog.51cto.com/images/editer/InBlock.gifelif [ "$a" = "大家好" ];then
http://blog.51cto.com/images/editer/InBlock.gifecho 大家好
http://blog.51cto.com/images/editer/InBlock.gifelif [ "$a" = "退出" ];then
http://blog.51cto.com/images/editer/InBlock.gifexit
http://blog.51cto.com/images/editer/InBlock.gifelse
http://blog.51cto.com/images/editer/InBlock.gifecho 错误的选项
http://blog.51cto.com/images/editer/InBlock.giffi
http://blog.51cto.com/images/editer/InBlock.gifdone
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