You can also use the dsh (distributed shell) from the AIX middleware. This software was first part of the PSSP software shipped with the SP/2 systems, then included in the PSSP-successors Cluster/1600, etc. It is basically a PERL wrapper which runs r-commands or ssh-commands against one or several machines, then combines the output from the different machines into a coherent format. You might have to modify it a little to run on non-AIX machines, but that should be pretty simple to achieve.

I hope this helps.

bakunin