Find and Terminate Processes by Name or Port

#!/bin/bash

# --- Find and kill process by name ---
PROCESS_NAME="node" # Common for Node.js dev servers, or 'php' for PHP built-in server

echo "Looking for processes named '$PROCESS_NAME' (using pgrep -f)..."
# pgrep -f searches the full command line, not just the process name
PID_BY_NAME=$(pgrep -f "$PROCESS_NAME")

if [ -n "$PID_BY_NAME" ]; then
    echo "Found PIDs for '$PROCESS_NAME': $PID_BY_NAME"
    read -p "Do you want to kill these processes? (y/N): " confirm_kill
    if [[ "$confirm_kill" =~ ^[Yy]$ ]]; then
        kill "$PID_BY_NAME" # Default is SIGTERM for graceful shutdown
        echo "Processes $PID_BY_NAME killed."
    else
        echo "Kill operation cancelled."
    fi
else
    echo "No processes found named '$PROCESS_NAME'."
fi

echo "
----------------------------------------"

# --- Find and kill process by port ---
PORT="3000" # Common port for local dev servers (e.g., React, Vue, Node.js apps)

echo "Looking for processes using port $PORT (using lsof)..."
# lsof -t -i :PORT lists the PIDs of processes using the specified port
# Requires 'lsof' to be installed (often available by default or via package manager)
PID_BY_PORT=$(lsof -t -i :$PORT)

if [ -n "$PID_BY_PORT" ]; then
    echo "Found PID using port $PORT: $PID_BY_PORT"
    read -p "Do you want to kill this process? (y/N): " confirm_kill_port
    if [[ "$confirm_kill_port" =~ ^[Yy]$ ]]; then
        kill "$PID_BY_PORT"
        echo "Process $PID_BY_PORT killed."
    else
        echo "Kill operation cancelled."
    fi
else
    echo "No process found using port $PORT."
fi