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lsof -i:port_number

# lsof -i:8000
COMMAND   PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
nodejs  26993 root   10u  IPv4 37999514      0t0  TCP *:8000 (LISTEN)

lsof -i:8080: Check port 8080 usage
lsof abc.txt: Show processes that have opened the file abc.txt
lsof -c abc: Show files currently opened by the abc process
lsof -c -p 1234: List files opened by the process with process ID 1234
lsof -g gid: Show the process status belonging to gid
lsof +d /usr/local/: Show files opened by processes in the directory
lsof +D /usr/local/: Same as above, but searches directories within the directory, takes longer
lsof -d 4: Show processes using fd as 4
lsof -i -U: Show all open ports and UNIX domain files

netstat -tunlp | grep port_number

netstat -ntlp   //View all current tcp ports
netstat -ntulp | grep 80   //View all 80 port usage
netstat -ntulp | grep 3306   //View all 3306 port usage

kill -9 PID

kill -9 26993