Question

记住我想要打破只有整个脚本的情况;哪个循环更适合这个问题？

#!/bin/bash
. /home/nayanc/project/info
. /home/nayanc/project/servers
#. /home/nayanc/project/cal
echo -e "1.System Information \n2.Calculation \n3.Server Configuration \n4.Exit"
read -p "Enter Your Choice " ch
case $ch in
1 )
        echo -e "a.Basic Information \nb.Intermedite Information \nc.All Information \nd.Exit from case \nExit from program"
        read -p "Enter Your Choice" ch1
        case $ch1 in
        a )
                basic
                ;;
        b )
                inter
                ;;
        c )
                myinfo1
                ;;
        esac
        ;;
2 )
        echo -e "a.Addition \nb.Subtraction \nc.multiplication \nd.Exit from case \ne.Exit from program"
        read -p "Enter your Choice " ch2
        case $ch2 in
        a )
                add_numbers
                ;;
        b )
                sub_numbers
                ;;
        c )
                mul_numbers
                ;;
        d )
                echo "Exit from Loop"
                break 1
                ;;
        e )
                echo "Exit from program"
                ;;
        * )
                echo "Please enter correct choice"
                ;;
        esac
        ;;
3 )
        ;;
4 )
        exit 0
        ;;
* )
        ;;
esac

Answer 1

break仅用于for，select，while和until循环，但不是以防万一。但似乎你有点困惑。默认使用;;如果终止案件而不是程序。

问题不是如何终止案例，而是如何让它一直运行直到我们想要终止它。

见这个例子：

echo -e "a.Basic Information \nb.Intermedite Information \nc.All Information \nd.Exit from case \ne.Exit from program"
read -p "Enter Your Choice" ch1
case $ch1 in
    a ) echo "-->run basic information script";;
    b ) echo "-->run intermediate information script";;
    c ) echo "-->run allinformation script";;
    d ) echo "-->Exit from case";;
    e ) echo "-->Exit from program"
        exit;;
    * ) echo "Wrong Selection - Try Again"
esac
echo "Command X: This is command X after the case" #Command inside program but out of case

如果按a，b，c或d，则执行相应的命令内部案例，案例将终止，并且由于程序未终止，命令X外部案例也将被执行。
但是如果按e，将执行命令exit内部情况，程序将被终止，因此最后一个命令X（外部情况）将不会被执行。

选择a，b，c或d

时的输出

root@debi64:/home/gv/Desktop/PythonTests# ./bashtest.sh
a.Basic Information 
b.Intermedite Information 
c.All Information 
d.Exit from case 
e.Exit from program
Enter Your Choice  : a
-->run basic information script
Command X : This is command X after the case
root@debi64:/home/gv/Desktop/PythonTests#

#If you select e, the last command X is not executed since program is  terminated due to exit.

如果你想让案件保持活着直到你选择（按d），那么你可以在案件之前使用while循环：

while [ "$ch1" != "d" ];do
    echo -e "a.Basic Information \nb.Intermedite Information \nc.All Information \nd.Exit from case \ne.Exit from program"
    read -p "Enter Your Choice  : " ch1
    case $ch1 in
        a ) echo "-->run basic information script";;
        b ) echo "-->run intermediate information script";;
        c ) echo "-->run allinformation script";;
        d ) echo "-->Exit from case";;
        e ) echo "-->Exit from program"
            exit;;
        * ) echo "Wrong Selection - Try Again"
    esac
done #if d or e are not pressed the menu will appear again
echo "Command X: This is command X after the case"

在上述情况/组合中，如果您选择a，b或c将执行相应的案例命令，将不执行命令X并重新加载案例菜单。

如果按d，情况将终止并且命令X将被执行，因为程序未终止。

如果按e，则案例和程序将exit，并且程序终止后将不会执行命令X.

或者你可以使用select＆amp;案例，类似于while＆amp;情况下：

IFS=$'\n' #necessary since select by default separates option using space as a delimiter
op=( "Basic Information" "Intermedite Information" "All Information" "Exit from case" "Exit from program" ) #Use an array
select ch1 in ${op[@]}; do
echo "You choose $ch1"
    case $ch1 in                                                                     #or case $ch1 in
            "Basic Information" )       echo "-->run basic information script";;        #${op[0} )....;;
            "Intermedite Information" ) echo "-->run intermediate information script";; #${op[1} )....;;
            "All Information" )         echo "-->run allinformation script";;           #${op[2} )....;;
            "Exit from case" )          echo "-->Exit from case"                        #${op[3} )....;;
                                        break;;
            "Exit from program" )       echo "-->Exit from program"                     #${op[4} )....;;
                                        exit;;
            * )                         echo "Wrong Selection - Try Again"
    esac                                                                                #esac
done
echo "Command X: This is command X after the menu"

再次按“退出大小写”，大小写和选择将被终止，并且选择后的命令X将被执行，因为程序没有终止。

如何从案例中断并继续其他循环

1 个答案: