Find out which application occupying a port in OSX
Sometimes during Rails development, I will force the unresponsive server to stop by doing control + z which could caused the server to occupy the 3000 port in the background.
Without having to restart the machine, we can use
lsof -i tcp:3000which represents List Open Files. Then, find out the pid and kill it with SIGKILL.
kill -9 [pid]Written by shinn
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