How to prevent execution of $ENV file in Korn shell scripts ?

[Pim Zandbergen]

golder at nwnexus.WA.COM (Warren Jones) writes:

>A related question:  When working on an HP-UX system a while back,
>I remember seeing in one of the manuals a trick for defining ENV
>so that the variable expands to the desired file name for interactive
>shells, but to a null string if the shell is not interactive.

>NOTE:  this is a different question, and does involve efficiency
>(though I'm sure not in any critical way).  After all, you don't
>need to read the ENV file when the shell is simply being used
>to glob some file names for an editor.  The trick involved checking
>the "$-" flags variable for the presence of the letter "i"
>(indicating an interactive shell).  I remember marveling at the
>time how wonderfully obscure and arcane it was, but I can't quite
>seem to reproduce it.  Can anyone out there provide the answer?

[[ ${-} = *i* ]] || ENV=
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