About Foreground and Background Tasks

In bash shell, scripts run in the foreground by default:

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$ ./backup.sh

If you want to move it to the background so that you could execute other commands in parallel, type Ctrl + Z and then execute the bg command:

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$ bg

Then you can see all background jobs with the jobs command:

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$ jobs

To return a script to the foreground, use the fg command:

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$ fg

You can also run a script in the background immediately with the & sign at the end:

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$ ./backup.sh &