Leonard,
If your linux distro supports PHP, then you should have no problem
running any PHP based application, not just a shopping cart
application. AFAIK, PHP can be compiled from source, or is available is
some pre-packaged form, for most Llnux distros.
I read on this list that
www.oscommerce.com has an excellent shopping
cart application. Visit them, see what requirements they mention (web
server, php version, database, etc) to install and use the app.
As long you can install PHP on your linux box (and the other
requirements as demanded by the web app) you should be okay.
If this was not what you intended to ask, please let us know.
Thanks,
--Kartic
PS: Of course, Google is your friend and look for keywords such as "PHP
Shopping Cart".