>From: dws@ssec.wisc.edu (DaviD W. Sanderson)
Date: Fri, 23 Oct 92 11:59:19 -0600

5.5)  How can I tell if I am running an interactive shell?

      In the C shell category, look for the variable $prompt.

      In the Bourne shell category, you can look for the variable $PS1,
      however, it is better to check the variable $-.  If $- contains
      an 'i', the shell is interactive.  Test like so:

          case $- in
          *i*)    # do things for interactive shell
                  ;;
          *)      # do things for non-interactive shell
                  ;;
          esac

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