Running the maintenance operations from command line

[TiKu]

Hi,

We've a quite huge forum and would like to run some of the maintenance scripts, for instance update the user rankings, the user renomee and so on.
Since the forum is huge, the web browser based scripts in admincp run for ages and most of the times they don't complete, for instance because the internet connection is terminated once in 24 hours.
Therefore we'd like to run the scripts directly on the server, from command line. How can this be done? I did not find any maintenance scripts that are meant to be run from command line.

Regards
TiKu