Cron vs. Command Line Problems

[David Cary Hart]

I have snort set up as a service. From the command line I can do
"service snort restart" and it performs precisely as expected.

Snort requires a restart after log rotate or it follows the old
alert.log. I have tried to do this a) via a cronned script, b) in the
logrotate script and c) by simply cronning the restart command line with
no joy.

What am I missing?