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Customize linux terminal PS1 variable in a function before starting a session

I often start a terminal session to servers from different tabs of my terminal. I would like to create a function that before starting the session it changes the title of the tab so that I can easily recognize which tab has which session open.

Let’s pretend here that my session is an ssh session. When I type in terminal

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where fn is a function defined in ~/.bashrc:

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the terminal starts the session and the title for the tab is changed ONLY AFTER the ssh session ends. I guess that this come because the session is open in the fn function, and only when the function returns is PS1 actualized. How to change the title/update the PS1 variable BEFORE the session begins?

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Answer

You are correct; your local host does not display another prompt after you add TITLE to PS1 until after ssh exits. Instead, just output TITLE immediately.

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Note that setting PS1 locally before running ssh has no effect on your prompt on the remote host anyway.

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