Kill a process which has a specific pid or is running on a specific port

kill_process

#!/bin/bash

print_usage() {
    echo "

////////////////////////////////////////////////////////////////////////////////////
* Kill a process which has a specific pid or is running on a specific port *
///////////////////////////////////////////////////////////////////////////////////

Usage:
	kill_process [OPTIONS]

Example
	kill_process --port=8080 # Kill the process running on port 8080.

	kill_process --pid=1111  # Kill the process with the pid 1111.

OPTIONS:

	--port:           The port on which the process is running.

	--pid:		  The pid of the process to kill.

Note: Atleast one of the option, --pid, --port, is expected. If both are provided, --port will take precedence.
"
}

while [ $# -gt 0 ]; do
  case "$1" in
    -h|--help*)
      print_usage
      exit 0
      ;;
    --port=*)
      port="${1#*=}"
      ;;
    --pid=*)
      pid="${1#*=}"
      ;;
    *)
      printf "\nError: Invalid argument: $1\n"
      print_usage
      exit 1
  esac
  shift
done


if [[ ! -z $port ]]; then
	pid="$(sudo lsof -Pi:$port -sTCP:LISTEN -t)"
	if [ -z "$pid" ]; then
		echo "kill_process: No process running on port, ($port)"
		exit 1
	fi
fi

if [[ -z $pid ]]; then
	echo "Atleast one of the option, --pid, --port, needs to be provided."
	exit 1
fi

sudo kill $pid -9