~/.bashrc 마지막에 이런걸 만들어주면 굳이 설치하지 않아도...

killport() {  
  if [ $# -ne 0 ]; then  
    for port in "$@"; do  
      pids=$(lsof -ti ":$port")  
      if [ -n "$pids" ]; then  
        echo "Processes listening on port $port: $pids"  
        echo "$pids" | xargs kill -9 >/dev/null 2>&1  
        echo "Processes listening on port $port have been terminated"  
      else  
        echo "No process found listening on port $port"  
      fi  
    done  
  else  
    echo "No arguments provided"  
  fi  
}