sudo kill -9 `sudo lsof -t -i:9001`
kill process on port
# To list any process listening to the port 8080: lsof -i:8080 # To kill any process listening to the port 8080: kill $(lsof -t -i:8080) # or more violently: kill -9 $(lsof -t -i:8080) # (-9 corresponds to the SIGKILL - terminate immediately/hard kill signal: see List of Kill Signals and What is the purpose of the -9 option in the kill command?. If no signal is specified to kill, the TERM signal a.k.a. -15 or soft kill is sent, which sometimes isn't enough to kill a process.).