Bash - 从子脚本退出父脚本
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Bash - Exit parent script from child script
提问by user1049697
I have a Bash parent script that on unexpected input calls an error logging child script that logs the error. I also want the execution to halt when the error occurs and the error script is called. But if I call exitfrom the error handling script it does not stop the parent script from executing. How may I go about stopping a parent script from a child?
我有一个 Bash 父脚本，它在意外输入时调用记录错误的错误记录子脚本。我还希望在发生错误并调用错误脚本时停止执行。但是如果我exit从错误处理脚本调用它不会停止父脚本的执行。我该如何停止孩子的父脚本？
采纳答案by jm666
try..
尝试..
#normal flow
[[ $(check_error_condition) ]] && /some/error_reporter.sh || exit 1
so,
所以，
- when the error_reporter will exit with exit status > 0 the parent will terminate too
- if the error_reporter will exit with status = 0 the parent continues...
- 当 error_reporter 以退出状态> 0 退出时，父级也将终止
- 如果 error_reporter 将以 status = 0 退出，则父级继续...
You don't want stop the parent from a child(the parents usually don't like this behavior) :), you instead want tell to parent - need stopand he will stop itself (if want) ;)
你不想要stop the parent from a child（父母通常不喜欢这种行为）:)，你想要tell to parent - need stop，他会停止自己（如果想要）;)
回答by anishsane
Try:
尝试：
In parent script:
在父脚本中：
trap "echo exitting because my child killed me.>&2;exit" SIGUSR1
In child script:
在子脚本中：
kill -SIGUSR1 `ps --pid $$ -oppid=`; exit
Other way was:
另一种方式是：
In child script:
在子脚本中：
kill -9 `ps --pid $$ -oppid=`; exit
But, it is not recommended, because the parent needs to have some information about getting killed & thus do some cleanup if required.
但是，不建议这样做，因为父级需要一些有关被杀死的信息，因此需要时进行一些清理。
Another way:
Instead of calling the child script, execit.
另一种方式：而不是调用子脚本，exec它。
However, as pointed out in other answer, the cleanest way is to exit from parent, after the child returns.
但是，正如其他答案中所指出的，最干净的方法是在孩子返回后从父母退出。
回答by valosekj
Extension to @anishsane comment because MacOS has little bit different pssyntax.
对@anishsane 注释的扩展，因为 MacOS 的ps语法略有不同。
Finding parent process ID (ppid) in child script under Mac OS (Darwin):
在 Mac OS (Darwin) 下的子脚本中查找父进程 ID (ppid)：
kill -SIGUSR1 $(ps $$ -o ppid=);exit
kill -SIGUSR1 $(ps $$ -o ppid=);exit
回答by Ansgar Wiechers
Don't try to terminate the parent from the child. Instead call exitin the parent after the child script returned.
不要试图从孩子中终止父级。而是exit在子脚本返回后调用父脚本。
if [ condition ]; then
/path/to/child.sh
exit 1
fi
or shorter
或更短
[ condition ] && { /path/to/child.sh; exit 1; }
