[Linux 常見問題] How to get child process from parent process

Source From Here
Question
Is it possible to get the child process id from parent process id in shell script?

How-To
You can leverage command pgrep. For example:

// List process tree
# ps auxf
...

// List process(s) with parent pid=3253
# pgrep -P 3253
3254
3545

// List process(s) with parent pid=3254
# pgrep -P 3254

// List process(s) with parent pid=3254
# pgrep -P 3545
3565
3712
3719
3736