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A much more meaningful example is an interactive command that you intentionally pause and then want to continue.
Example: top
Start:
Loading...top is now running in the foreground, and you can interact with it.Press:
Loading...Now:
Loading...You'll see:
Loading...Now you want to continue using
top:Loading...top comes back to the terminal, and you can again interact with it.What fg actually means
Think of it as:
Loading...For teaching, I would write:
Loading...Use case: You temporarily stopped an interactive process and now want to give it the terminal again.