select结构是建立菜单的另一种工具，该结构是从ksh中引入的

1.select格式

select variable [ in list ]

do

 commands

done

如果忽略了in list列表，那么select命令将会使用传递到脚本的命令行参数($@)，或者是函数参数(当select是在函数中时)

2.样例

样例-1：

[root@kibana ~]# cat select-1.sh 
#!/bin/bashPS3='Choose your favorite vegetable: '
#设置提示符字符串
echoselect vegetable in "beans" "carrots" "potatoes" "onions" "rutabagas"
doechoecho "Your favorite vegetable is $vegetable."break
doneexit 0
[root@kibana ~]# sh select-1.sh 1) beans
2) carrots
3) potatoes
4) onions
5) rutabagas
Choose your favorite vegetable: 1Your favorite vegetable is beans.
[root@kibana ~]# 

样例-2：

[root@kibana ~]# cat select-2.sh 
#!/bin/bashPS3='Choose your favorite vegetable: '
#设置提示符字符串
echofunction choice_of_vegetable ()
{select vegetable#[in list]被忽略，select会使用传递给函数的参数.doechoecho "Your favorite vegetable is $vegetable."breakdone
}choice_of_vegetable "beans" "carrots" "potatoes" "onions" "rutabagas"#  $1       $2        $3         $4        $5#传递给choice_of_vegetable()的函数
exit 0
[root@kibana ~]# sh select-2.sh 1) beans
2) carrots
3) potatoes
4) onions
5) rutabagas
Choose your favorite vegetable: 1Your favorite vegetable is beans.
[root@kibana ~]#