We use cron to run tasks every once in a while. To see the current list of jobs that run, do:
To edit them:
To see what the file format is, read this reference.
The planet program lives in ~/planet-prog/. It outputs to ~/public_html/planet/ via an every-30m cron job.
It's in ~/planet-prog/examples/fancy/config.ini . It's pretty self-explanatory.
You could try upgrading it using "bzr". I wouldn't try it without backing up ~/planet-prog/. I expect it to clobber ~/planet-prog/examples/fancy/config.ini.