合格linux運維人員必會的30道shell編程實踐題及講解-12

企業實踐題12：打印選擇菜單，一鍵安裝Web服務：

[root@oldboyscripts]# sh menu.sh

    1.[install lamp]

    2.[install lnmp]

    3.[exit]

    pls input the num you want:

要求：

一、當用戶輸入1時，輸出「startinstalling lamp.」而後執行/server/scripts/lamp.sh，腳本內容輸出"lampis installed"後退出腳本；

二、當用戶輸入2時，輸出「startinstalling lnmp.」而後執行/server/scripts/lnmp.sh輸出"lnmpis installed"後退出腳本;

三、當輸入3時，退出當前菜單及腳本；

四、當輸入任何其它字符，給出提示「Input error」後退出腳本。

五、要對執行的腳本進行相關條件判斷，例如：腳本是否存在，是否可執行等。

#!/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