which does not produce a file name that sorts the way I like. I would use something like...
$ date +"%Y-%m-%d_%R" 2004-01-23_09:01
That's highly recommended, although %Y-%m-%d generally suffices, since logrotate won't run more than once per day unless forced.
Dropping something like the following in the appropriate section of logrotates.conf or logrotate.d appears to work splendidly, if you want to keep these logs indefinately. You may also want to use 'rotate 0'.
I used /etc/logrotate.d/rpm for testing:
postrotate /bin/cp /var/log/rpmpkgs.1 /var/log/rpmpkgs-`/bin/date +"%Y-%m-%d-%R"` endscript
