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From: bfox@aurel.caltech.edu (Brian Fox)
Newsgroups: gnu.bash.bug
Subject: Init files (was Questions/bugs.)
Message-ID: <8906210020.AA03847@aurel.caltech.edu>
Date: 21 Jun 89 00:20:37 GMT
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   Date: Tue, 20 Jun 89 10:02:58 -0400
   From: James J Dempsey <jjd@bbn.com>

   Having said this, I think there should also be some way of determining
   from inside .bashrc whether or not a given session is interactive or
   not.

In bash, if PS1 is not set, then the shell is not interactive.

Brian Fox