When I start my tcp server from my bash script, I need to kill the previous instance (which may still be listening to the same port) right before the current instance starts listening.
I could use something like pkill <previous_pid>
. If I understand it correctly, this just sends SIGTERM
to the target pid. When pkill
returns, the target process may still be alive. Is there a way to let pkill
wait until it exits?
No. What you can do is write a loop with kill -0 $PID
. If this call fails ($? -ne 0
), the process has terminated:
while kill -0 $PID; do
sleep 1
done
(kudos to qbolec for the code)
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