Shell tutorial part 16: processes

We will learn what background and foreground processes are and how to control them, for example starting background processes using '&', moving foreground processes to the background and suspending them using Ctrl+z, how to let background process run using bg, how to kill foreground processes using Ctrl+c, and how to view and kill processes using commands like ps, kill, fg, jobs.
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Video content:
0:00 : Introduction. A process is an instance of a program that is being executed right now. When you start a program, you start a process for that program. You can open multiple processes for the same program.
0:50 : Foreground processes. These processes run in the "foreground" of the shell, and don't allow us to use the shell to run other programs.
1:15 : Ctrl+c. Pressing this combination exits foreground processes.
1:30 : Background processes. These processes run in the "background" of the shell, allowing us to continue using it.
1:50 : &. Using the ampersand after the name of a program allows us to open it in the background.
2:37 : ps. Presents a list of all running processes that were started from the current shell.
3:20 : kill |pid|. "Kills" (closes) the process associated with the given pid (process-id).
3:38 : ps -A. Presents all processes currently running, not only those started from the current shell.
4:32 : Ctrl+z. Allows us to move a currently running foreground process to the background. This suspends the program - while the program is in the background, time is frozen for it - the program isn't running, as shown in 5:47.
4:52 : jobs. Presents background processes started from the current shell.
5:04 : fg |job-id|. If the given |job-id| is associated with a job, moves it from the background to the foreground.
5:28 : sleep |seconds|. "Sleeps" the given amount of |seconds|.
5:47 : Suspended background processes. While a program is suspended, time is frozen for it - the program isn't running.
6:35 : bg |job-id|. If the given |job-id| is associated with a suspended background process, it will be resumed ("unsuspended"), while still in the background.
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Relevant links:
The complete shell tutorial playlist: https://www.youtube.com/playlist?list=PLuHmgt1HXB7AoJRbiSPzJ22uz34isVF__