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kill -9 $(sudo lsof -ti:3000) # force kill one port
kill -9 $(sudo lsof -ti:3000,3001) # force kill multiple port
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sudo lsof -i :5955
ex returns:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
node 6957 someuser 28u IPv6 0x85e555655e4ea0c3 0t0 TCP *:8091 (LISTEN)
sudo kill -9 6957