interactive vs cron called

[Jason Zapman II <zapman@cc.gatech.edu>]

Is there a way to tell if a script is being called by cron or via
interactive script?  I'm writing something to tell me when disk usage of
various partitions get's to dangerous levels.  When it's run via cron, I
want it to mail me the results.  If it's interactive, I want it to print
the output to the screen.

Any ideas?

Thanks;
Jason

-- 
     Jason Price    |     If you want to build a ship, don't drum up people 
      Theta Xi,     |   together to collect wood and don't assign them tasks
   Beta, Alpha 449  | and work, but rather teach them to long for the endless 
 jprice@poboxes.com |    immensity of the sea. -- Antoine de Saint Exupery