HOW do you tell KSH is interactive ?

[Gene Spafford]

If you only want to do something if you are interactive, then put the
following at the appropriate places in your $ENV file:

if [[ $- = *i* ]]
then
    do stuff for interactive here
fi
-- 
Gene Spafford
NSF/Purdue/U of Florida  Software Engineering Research Center,
Dept. of Computer Sciences, Purdue University, W. Lafayette IN 47907-2004
Internet:  spaf at cs.purdue.edu	phone:  (317) 494-7825