How to get the PID of a process that is piped to another process in Bash?

Question

I am trying to implement a simple log server in Bash. It should take a file as a parameter and serve it on a port with netcat.

( tail -f $1 & ) | nc -l -         


        

Answer 1

Not an ideal answer, but I found a workaround for a logger daemon I worked on:

#!/bin/sh
tail -f /etc/service/rt4/log/main/current --pid=$$ | grep error

from $info tail:

--pid=PID
          with -f, terminate after process ID, PID dies