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This question already has an answer here:

I want to launch a sleep in the background,

bg sleep 100

but sleep 100 seems not to exist, is there a mistake? Do I have to launch a sleep before? It seems odd, as far as I would have no more control...

marked as duplicate by muru, chaos, dr01, taliezin, John WH Smith Oct 2 '15 at 9:31

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  • Have you checked out the manual for bg? It expects job id as the argument, not a shell command. – Dmitry Grigoryev Oct 2 '15 at 8:30
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Usually, a command is run in the background with &.

So sleep 100 & should give you the results you are looking for.

You can also do as you posted in your answer, the problem is that when running bg you'd better tell what you want to run in the background so, after CTRL+Z you should run jobs and identify your job in case there are more than one, and after that run bg %your_job_id.

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