Shell break while-true循环

发布时间：2020-12-15 21:57:22 所属栏目：安全来源：网络整理

导读：有下面的 shell,它在(while true)循环中有一个(while true)循环.我试图用“休息”打破内循环,但事实并非如此. 我想打破内循环显示用户第一循环的选项;建议请. #!/bin/ksh sub_menu() { echo "~~~~~~~~~~~~~~~~~~~~~~~~~" echo " S U B - M E N U " echo "~~~

有下面的 shell,它在(while true)循环中有一个(while true)循环.我试图用“休息”打破内循环,但事实并非如此.
我想打破内循环&显示用户第一循环的选项;建议请.

#!/bin/ksh
    sub_menu() {
    echo "~~~~~~~~~~~~~~~~~~~~~~~~~"    
    echo "    S U B - M E N U "
    echo "~~~~~~~~~~~~~~~~~~~~~~~~~"
    echo "1. Display properties"
    echo "2. Back"
    }

    read_sub_options(){

    echo "Please select option" 
    read option
    case $option in
        1) sub_menu ;;
        ***2) break ;;***
        *) echo "Please insert options 1 ~ 2";;
        esac
    }

showSubMenu(){
    while true
    do
        sub_menu
        read_sub_options
done    
}

read_options(){ 
echo "Please select option "
    read option
    case $option in
        1) showSubMenu ;;
        2) exit 0;;
        *) echo "Please insert options ";;
    esac
}

show_menus() {
    echo "~~~~~~~~~~~~~~~~~~~~~"    
    echo "   M A I N - M E N U "
    echo "~~~~~~~~~~~~~~~~~~~~~"
    echo "1. Sub Menu"
    echo "2. Exit"
}

# -----------------------------------
#           MAIN 
# ------------------------------------
while true
do
    show_menus
    read_options
done

这是输出：

~~~~~~~~~~~~~~~~~~~~~
   M A I N - M E N U
~~~~~~~~~~~~~~~~~~~~~
1. Sub Menu
2. Exit
Please select option
1
~~~~~~~~~~~~~~~~~~~~~~~~~
    S U B - M E N U
~~~~~~~~~~~~~~~~~~~~~~~~~
1. Display properties
2. Back
Please select option
2
~~~~~~~~~~~~~~~~~~~~~~~~~
    S U B - M E N U
~~~~~~~~~~~~~~~~~~~~~~~~~
1. Display properties
2. Back
Please select option
2

解决方法

以下脚本适用于此处.

所做的更改是,如果调用了sub_menu,则read_sub_options返回2,当选择Back选项时返回1,然后检查showSubMenu中最后一次运行命令的返回值,如果选择了Back,则中断.

有关更多KSH脚本参考信息,请参见KSH script basics和Learning the Korn shell.

有关菜单选择的其他方法的信息,请参阅select和ksh手册页,如您的问题评论中所述.

#!/bin/ksh
sub_menu() {
echo "~~~~~~~~~~~~~~~~~~~~~~~~~"    
echo "    S U B - M E N U "
echo "~~~~~~~~~~~~~~~~~~~~~~~~~"
echo "1. Display properties"
echo "2. Back"
return 2;
}

read_sub_options(){

echo "Please select option" 
read option
case $option in
    1) sub_menu ;;
    2) return 1;;
    *) echo "Please insert options 1 ~ 2";;
    esac
}

showSubMenu(){
while true
do
    sub_menu
    read_sub_options
    if [[ $? == 1 ]] ; then
    break
    fi
done    
}

read_options(){ 
echo "Please select option "
    read option
    case $option in
        1) showSubMenu;;
        2) exit 0;;
        *) echo "Please insert options ";;
    esac
}

show_menus() {
    echo "~~~~~~~~~~~~~~~~~~~~~"    
    echo "   M A I N - M E N U "
    echo "~~~~~~~~~~~~~~~~~~~~~"
    echo "1. Sub Menu"
    echo "2. Exit"
}

# -----------------------------------
#           MAIN 
# ------------------------------------
while true
do
    show_menus
    read_options
done

（编辑：李大同）

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