Process...What is that?🤔

• A process is an instance of one or more related tasks (threads) executing on your computer. 🔁
• Not the same as a program or a command. ❌
• A single command may start several processes simultaneously.
• Some processes are independent of each other while others are related. 👉🏽🐧👈🏽
• A failure of one process may or may not affect the others running on the system.

Process Id(PID) 웃:

• There are always multiple processes being executed in the background.
• The operating system keeps track of them by assigning each a unique process ID (PID) number, used to track process state, CPU usage, memory usage, etc.

Thread ID(TID) 웃웃웃웃웃웃:

• For a multi-threaded process, each thread shares the same PID but has a unique TID.

• To get a task-manager-ish view of running processes🧑🏽‍💼: top

• To kill a process (you can only kill your processes; those belonging to another user are off-limits unless you are root): kill -SIGKILL <pid>or kill -9 <pid>

To kill an app running in background💻:

• First, we need a PID of that app(grep works as a filter)🔎: top | grep <appName>
• Now that we have a PID, we can kill that app/process ✖‿✖:
  kill -9 <pid of that app>