A useful shell command for killing processes by port

Hey everyone, I want to share with you a commandline function that helps quickly kill processes by their port. Some of the servers I start up love to stay running in the background after I closed them. So I often get errors that say something like:

error: [Errno 48] Address already in use

or

Failed to listen on localhost:8000 (reason: Address already in use)

Here is a function to quickly kill any rogue processes on a certain port

To use this, just add it to ~/.bashrc or ~/.zshrc file:

# Kills a process running on a specified tcp port
killport() {
  echo "Killing process on port: $1";
  kill -9 $(lsof -t -i:$1 -sTCP:LISTEN)
}

Reload your terminal and now you call kill any port you need access to

> killport 9000
Killing process on port: 8000