If you mean that you've installed new packages within your LaTeX distro, the update command (as root) is "texhash". If you're talking about updating LaTeX itself, I don't know. Probably best to wipe your old distribution and start from fresh.
Thanks, Robin! I mean something like what happens with MikTeX (the LaTeX version for MS Windows), which comes with a wizard that allows us to update the packages of the LaTeX distribution installed on our machine. Furthermore, it entitles us to choose the mirror to be used for the updating. This feature is quite useful, as the domestic Internet traffic is much cheaper than the international one.
Paul
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