How to know two process ids in “tail -f filename.dat | nc localhost 36000 &”

Question

As described in the title, I want to know the process id of tail and nc .

It is easy to use $! to get the pid of nc , but how about tail ?

Answer 1

From comments - you're wanting to terminate these processes once a separate event occurs.

Try a subshell. ( cat -v in the below for my testing)

eg

( tail -f /path_to_file/ | cat -v ) & echo $!

This will give you a pid of a spawned subshell, which you can kill and get your sub processes at the same time.