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Is it possible to run source ~/.bashrc once but for all my N shell sessions (I'm talking about sessions related to one gnu screen of course) ?

Same question but for things like export TEST_VAR=whatever in one shell sessions.

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    When you say Windows, do you mean terminal sessions? – Raman Sailopal Sep 21 '17 at 12:38
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    @RamanSailopal The question is tagged gnu-screen, so I presume it's related to windows within a screen session. – Kusalananda Sep 21 '17 at 12:43
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    How do you usually start your screen sessions? The sessions would inherit the environment variables from the calling shell. – Kusalananda Sep 21 '17 at 12:45
  • @Kusalananda I just run screen – smarber Sep 21 '17 at 12:59
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If I understand your question correctly, you have N shell sessions in one GNU screen and you want to execute a given shell command (such as source ~/.bashrc or export TEST_VAR=whatever) in all shell sessions at once.

This can be done from inside your screen session with:

Ctrl-A:at "#" stuff "export TEST_VAR='whatever'\n"

This can be done from anywhere with:

screen -X at "#" stuff "export TEST_VAR='whatever'\n"

(you may want to specify a particular screen session with the -S option)

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