What is Apple doing with UUCP? I have been looking into UUCP (Unix-to-Unix Copy, a very old network protocol) as a way of communicating with some Linux boxes that don't always have an internet connection. While doing so on my Macbook (with El Capitan), I found entries in my /usr/share/uucp/sys file for uucpsys1.apple.com and uucpsys2.apple.com. (You can also see these by running uuchk | less.)

What is Apple doing with UUCP? I found this post on the Apple forums by someone who noticed a UUCP user, but no one came forward with an explanation, so I'm hoping someone here will know.

I'm especially curious because /usr/share/* falls under System Integrity Protection in El Capitan, which means I'll need to set up a separate UUCP implementation if I want to use it for my purposes — but it also suggests that, if Apple's shipping OS X with a UUCP that only they can use, they must be using it for something. 

ETA: I've also found a launchd daemon at /System/Library/LaunchDaemons/com.apple.uucp.plist. It has &lt;key&gt;Disabled&lt;/key&gt;&lt;true/&gt; in the plist, so it won't be run by default, but other daemons could enable it programmatically without altering the plist. I'm also intrigued to see that it's in /System/Library/LaunchDaemons/ (and thus subject to SIP) rather than /Library/LaunchDaemons/ — it adds to my hunch that it's something Apple is using (or maybe was using, as patrix comments), rather than just a miscellaneous *nix tool they happened to include.
Those entries are examples that can be used as templates in user defined configurations. 

See the same examples at:

http://www.opensource.apple.com/source/uucp/uucp-11/configs/sys


You can see those examples in the same way as the phone prefix +555 in the movies. It there to show somebody using a phone, but the fake number/name cant be called. Placing an example with a ficticious hostname allows to have a template.