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Setting DISPLAY in all windows

From: Jean Jordaan
Subject: Setting DISPLAY in all windows
Date: Thu, 25 May 2006 09:25:15 -0000
User-agent: Mozilla Thunderbird 1.0.8 (X11/20060502) 
Hi all

My terminal died. After reconnecting to screen, DISPLAY in all
sessions is wrong, so X apps don't start properly. Instead of
saying 'export DISPLAY=...' in each session, I'd like to set it
for all of them at once. This is what I tried, but no joy:

  screen -p1 -X exec export TEST=42
  screen -p2 -X exec export TEST=42
  ...

Does anyone know the correct incantation?

Regards,
Jean
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