今天天气阴，有点儿无聊，就做了这么无趣的玩样儿。。。。。。

#!/bin/bash
#Date:2017-6-20
#Version:1.0
#Author:xcn(baishuchao@yeah.net)
menu(){
cat<<END
1.[installlamp]
2.[installlnmp]
3.[exit]
plsinputthenumyouwant:
END
read-t15a
}
menu1(){
cat<<END
1.[APCHE]
2.[MysqL]
3.[PHP]
4.[BACK]
Plsinputthelampmenunumyouwant:
*************************************
END
readnum1
}
menu2(){
cat<<END
1.[Nginx]
2.[MysqL]
3.[PHP]
4.[BACK]
Plsinputthelnmpmenunumyouwant:
**************************************
END
readnum2
}
#######################[menu1]############################
menu
[$a-eq1]&&{
clear
menu1
[$num1-eq1]&&{
echo"installingapache"
sleep3
echo"installisapacheed"
menu1
}
[$num1-eq2]&&{
echo"installingMysqL"
sleep3
echo"installisMysqLed"
menu1

}
[$num1-eq3]&&{
echo"installingPHP"
sleep3
echo"installisPHP"
menu1

}
[$num1-eq4]&&{
echo"returntoprevIoUsmenu"
menu

}

}
####################[menu2]########################################
[$a-eq2]&&{
clear
menu2
[$num2-eq1]&&{
echo"installingNginx"
sleep3
echo"installisNginx"
menu2
}
[$num2-eq2]&&{
echo"installingMysqL"
sleep3
echo"installisMysqLed"
menu2

}
[$num2-eq3]&&{
echo"installingPHP"
sleep3
echo"installisPHP"
menu2

}
[$num2-eq4]&&{
echo"returntoprevIoUsmenu"
menu

}

}
[$a-eq3]&&{
echo"baybay"
exit
}


奇迹出现：
[root@XCN~]#shmenu.sh
1.[installlamp]
2.[installlnmp]
3.[exit]
plsinputthenumyouwant:
1

1.[APCHE]
2.[MysqL]
3.[PHP]
4.[BACK]
Plsinputthelampmenunumyouwant:
*************************************
2
installingMysqL
installisMysqLed
1.[APCHE]
2.[MysqL]
3.[PHP]
4.[BACK]
Plsinputthelampmenunumyouwant:
*************************************