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How can a program know if screen number changes?


From: Chip Salzenberg
Subject: How can a program know if screen number changes?
Date: Wed, 11 Jul 2012 16:31:17 -0700

I put my screen number in my prompt (PS1).  I would like to know if the current screen number has changed from what it was.  How can I learn this?  Is there a status string I can request, e.g?
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