You can also just write your crontab in any editor you like, save it in
a file, and do :
prompt> crontab <yourfilename>
This replaces your current crontab with the contents of your file.
This is a good example of how this topic got lost in this thread. Both of
these were already mentioned. :)
I have to admit I don't read every message which comes to this list -
the volume is too high to make that practical. Hence, I don't post
often for just this reason... I'm probably duping something someone
else says.