How to get PID from forked child process in shell script

Question

I believe I can fork 10 child processes from a parent process.

Below is my code:

#/bin/sh
fpfunction(){
    n=1
    while (($n<20))
    do
        ech         


        

Answer 1

From the Bash manual:

!

Expands to the process ID of the most recently executed background (asynchronous) command.

i.e., use $!.