如何使用Ctrl + C停止整个脚本而不仅仅是当前命令 [英] How to use Ctrl+C to stop whole script not just current command

问题描述

我有一个如下脚本:

for ((i=0; i < $srccount; i++)); do
    echo -e "\"${src[$i]}\" will be synchronized to \"${dest[$i]}\""
    echo -e $'Press any key to continue or Ctrl+C to exit...\n' 
    read -rs -n1
    rsync ${opt1} ${opt2} ${opt3} ${src[$i]} ${dest[$i]}
done

如果响应读取命令按 Ctrl + C ，则整个脚本将停止，但是如果按 Ctrl + C 在运行 rsync 命令时，仅当前的 rsync 命令将停止，脚本将继续执行for循环.

If I press Ctrl+C in response to read command, the whole script will stop, but if press Ctrl+C while rsync command is running, just current rsync command will stop and the script will continue the for loop.

有什么方法可以告诉脚本，如果在 rsync 运行时用户是否按下 Ctrl + C ，请停止 rsync 并退出脚本本身?

Is there any way to tell the script if the user pressed Ctrl+C while rsync is running, stop rsync and exit from the script itself?

推荐答案

Ctrl + C 发送中断信号 SIGINT .您需要通过内置的 trap 告诉bash在收到此信号时退出:

Ctrl+C sends the interrupt signal, SIGINT. You need to tell bash to exit when it receives this signal, via the trap built-in:

trap "exit" INT
for ((i=0; i < $srccount; i++)); do
    echo -e "\"${src[$i]}\" will be synchronized to \"${dest[$i]}\""
    echo -e $'Press any key to continue or Ctrl+C to exit...\n' 
    read -rs -n1
    rsync ${opt1} ${opt2} ${opt3} ${src[$i]} ${dest[$i]}
done

您不仅可以在收到信号后退出，还可以做更多的事情.通常，信号处理程序会删除临时文件.有关更多详细信息，请参考 bash文档.

You can do more than just exiting upon receiving a signal. Commonly, signal handlers remove temporary files. Refer to the bash documentation for more details.

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