Useful command: check running processes

gistfile1.txt

# list all listening ports
sudo lsof -i -P | grep -i "listen"

# list all processes using specific port - this will list all pid that using port 8080
lsof -i :8080 | grep "LISTEN"

# tell which application is running on specfic pid (for example,  1237)
ps -ef | grep 12337

# kill processes using port 8888 
kill $(lsof -t -i :8888)