＆＃34; kill -0＆＃34;有什么区别？和＆＃34;杀死-9＆＃34;？

Question

请解释上面的区别。 ＆＃34; kill -0＆＃34;和＆＃34;杀死-9＆＃34;

Answer 1

https://unix.stackexchange.com/a/169899/55635

杀灭（1）

$ man 1 kill
...
If sig is 0, then no signal is sent, but error checking is still performed.
...

杀灭（2）

$ man 2 kill
...
If sig is 0, then no signal is sent, but error checking is still performed; 
this can be used to check for the existence of a process ID or process 
group ID.
...

因此，信号0实际上实际上并不会向您的进程的PID发送任何内容，但实际上会检查您是否有权这样做。

虽然kill -9 - 实际上将SIGKILL发送到PID