bg-fg-processes

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Roadmap info from roadmap website

Managing bg (background) and fg (foreground) Processes

In Linux environment, a process can be run in either the foreground (fg) or the background (bg). The foreground process takes input directly from the user, displaying output and errors to the user’s terminal. On the other hand, a background process runs independently of the user’s actions, freeing up the terminal for other tasks.

Typically, a process starts in the foreground. However, you can send it to the background by appending an ampersand (&) to the command or by using the bg command. Conversely, the fg command brings a background process to the foreground.

Here’s how you can send a running process to background:

command &

Or if a process is already running:

CTRL + Z       # This will pause the process
bg             # This resumes the paused process in the background

And to bring it back to the foreground:

fg

These commands, bg and fg are part of job control in Unix-like operating systems, which lets you manage multiple tasks simultaneously from a single terminal.