“kill-0”和“kill-9”有什么区别?[副本]

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

杀死(1)

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

杀死(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实际上不会向进程的PID发送任何内容,但实际上会检查您是否有这样做的权限。

虽然 kill -9 -实际向PID发送SIGKILL