How to run nohup and write its pid file in a single bash statement

Question

I want to run my script in background and then write its pid file. I am using nohup to do this.

This is what i came up with,

nohup ./myprogram.sh > /d         


        

Answer 1

Grigor's answer is correct, but not complete. Getting the pid directly from the nohup command is not the same as getting the pid of your own process.

running ps -ef:

root     31885 27974  0 12:36 pts/2    00:00:00 sudo nohup ./myprogram.sh
root     31886 31885 25 12:36 pts/2    00:01:39 /path/to/myprogram.sh

To get the pid of your own process, you can use:

nohup ./myprogram.sh > /dev/null 2>&1 & echo $! > run.pid
# allow for a moment to pass
cat run.pid | pgrep -P $!

Note that if you try to run the second command immediately after nohup, the child process will not exist yet.