BASH - Check if PID Exists

Question

I want to stall the execution of my BASH script until a process is closed (I have the PID stored in a variable). I\'m thinking

while [PID IS RUNNING]; do
sleep 5         


        

Answer 1

kill -s 0 $pid will return success if $pid is running, failure otherwise, without actually sending a signal to the process, so you can use that in your if statement directly.

wait $pid will wait on that process, replacing your whole loop.