Question

所以我试图创建一个脚本，为用户提供一些操作选项，其中一个选项是退出脚本。但是，我想阻止用户使用Control c退出脚本，以便退出的唯一方法是选择正确的选项。是否可以制作脚本，以便当用户点击control c时，程序不会退出，而是会echo "enter 0 to exit"之类的内容？

#!/bin/bash
# Acts as a simple administration menu

OPTION=0

echo "-----------------Admin Menu-------------------"   
echo "Please select one of the following options:   "
echo ""
echo "1 - Run top."
echo "2 - Show system uptime."
echo "3 - Show logged in users."
echo "4 - Exit Menu."
echo "5 - Reprint this menu."
echo "----------------------------------------------"
echo "Please choose an option (5 to reprint menu):"
read OPTION

while [ "$OPTION" -ne 4 ]
do
    if [ "$OPTION" -eq 1 ]; then
        clear
        top -n1
    elif [ "$OPTION" -eq 2 ]; then
        clear
        uptime
    elif [ "$OPTION" -eq 3 ]; then
        clear
        who
    elif [ "$OPTION" -eq 4 ]; then
        clear
        OPTION=4
    elif [ "$OPTION" -eq 5 ]; then
        clear
        echo "------------COSC 2306 Admin Menu--------------"   
        echo "Please select one of the following options:   "
        echo ""
        echo "1 - Run top."
        echo "2 - Show system uptime."
        echo "3 - Show logged in users."
        echo "4 - Exit Menu."
        echo "5 - Reprint this menu."
        echo "----------------------------------------------"

    else
        clear
        echo "ERROR: Incorrect Input."
    fi
    echo "Please choose an option (5 to reprint menu):"
    read OPTION
done
clear

Answer 1

您可以使用内嵌trap来抓住SIGINT（ctrl + C生成信号SIGINT）并打印您的消息：

trap 'echo "enter 0 to exit"' SIGINT

同样，您也可以捕获其他信号。要获取信号列表，请使用kill -l。

防止shell脚本退出Control C

1 个答案: