lsof

At times, you get address in use error for web servers in development environment. Use lsof to find out the process using the port. # to get all the ports sudo lsof -nP -iTCP -sTCP:LISTEN # to get a particular port sudo lsof -nP -iTCP:3000 -sTCP:LISTEN

1. lsof lsof -i To find the process which uses a port 8080, lsof -i :8080 To find the process which uses a TCP port 3005, lsof -i tcp:3005 I often have trouble finding a process which uses a port. I used the lsof command to find the process which uses a port. then I kill the process using the kill command. kill -9 PID