合格linux运维人员必会的30道shell编程实践题及讲解-12

企业实践题12：打印选择菜单，一键安装Web服务：

[root@oldboyscripts]# sh menu.sh

    1.[install lamp]

    2.[install lnmp]

    3.[exit]

    pls input the num you want:

要求：

1、当用户输入1时，输出“startinstalling lamp.”然后执行/server/scripts/lamp.sh，脚本内容输出"lampis installed"后退出脚本；

2、当用户输入2时，输出“startinstalling lnmp.”然后执行/server/scripts/lnmp.sh输出"lnmpis installed"后退出脚本;

3、当输入3时，退出当前菜单及脚本；

4、当输入任何其它字符，给出提示“Input error”后退出脚本。

5、要对执行的脚本进行相关条件判断，例如：脚本是否存在，是否可执行等。

#!/bin/bash
[ -f /etc/init.d/functions ] && . /etc/init.d/functions
menu(){
cat << END
==================================
   1.[install lamp]
   2.[install lnmp]
   3.[exit]
   please input the num you want:
==================================
END
}
menu
read num
[ $num -eq 1 ] && {
    echo "start installing lamp."
    if [ -x /server/scripts/lamp.sh ]'then
         /bin/bash /server/scripts/lamp.sh
    else 
         exit 1
}
[ $num -eq 2 ] && {
    echo "start installing lnmp."
    if [ -x /server/scripts/lnmp.sh ]'then
         /bin/bash /server/scripts/lnmp.sh
    else 
         exit 2
}
[ $num -eq 3] && exit $RERVAL
echo "input error" && exit $RERVAL

#!/bin/bash
[ -f /etc/init.d/functions ] && . /etc/init.d/functions
cat << MENU
   1.[install lamp]
   2.[install lnmp]
   3.[exit]
   please input the num you want:
MENU
read num
case "$num" in
    1)
        echo "start installing lamp."
        if [ -x /server/scripts/lamp.sh ]'then
            /bin/bash /server/scripts/lamp.sh
        else
            exit 1
    2)
        echo "start install lnmp."
        if [ -x /server/scripts/lamp.sh ]'then
            /bin/bash /server/scripts/lnmp.sh
        else
            exit 1
    3)
        exit $RETVAL
    *)
        echo "input error" && exit $RETVAL
esac