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I know how to send process to background and foreground which has started through shell using bg and fg commands.

How can I send process which has started by clicking icons or menu? like I open firefox from menu and I want to send this opened firefox to background and to foreground when I would want?

I could not found man page of bg.

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tl;dr I don't think you can.

fg and bg (and Ctrl-z) interact with processes started by the current shell ("jobs"), and it would be a security issue if a shell could take over a job of another shell.

See the "job control" section of man bash for details.

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