Re: if else

|Fri 98-05-29 Philip Guenther <guenther(_at_)gac(_dot_)edu> list.procmail
| The easiest way to check whether a variable is set (not just whether it
| contains a non-empty value) is the following condition:
| 
|       * $ ! ${SPAM+!}

I have found it more readable to use alternative:

    spam        # kill variable

See if variable is empty:

    * spam ?? ^^^^

See if variable is not empty

    * ! spam ?? ^^^^


Cheers!
jari