man page, it says:
0 All processes in the current process group are signaled
And I tried like this:
$ man kill &  15247 $ + Stopped man kill $ kill 0 $ ps 15247 pts/41 00:00:00 man
As I understood,
kill 0 will kill all processes in the current process, which includes
pid15247. However, it didn't do anything in this example. Does anyone have ideas about how to use it?