I think the lpr command is a part of cups. You could print to two computers using this but you need to write a script to do this. Is the file a txt, pdf, or ps? lpr needs this format.

From: Shawn Badger <shawn@badger.pro>
To: plug-discuss@lists.plug.phoenix.az.us
Sent: Tuesday, March 13, 2012 8:32 AM
Subject: Printing a job to 2 printers at the same time

Does anyone know of way to print the same job to multiple printers though CUPS?

I found tea4cups http://www.pykota.com/software/tea4cups but it looks
like it hasn't been maintained in a while and it is behind a $25
paywall.
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