Software Upgrade Protocol

The Software Upgrade Protocol (or SUP) System is a set of programs developed by Carnegie Mellon University in the 1980s[https://www.cs.cmu.edu/afs/cs.cmu.edu/project/mach/public/sup/sup.ps The SUP Software Upgrade Protocol] - Steven Shafer & Mary Thompson, Carnegie Mellon University School of Computer Science, 7 September 1989. (as was the Andrew File System). It provides for collections of files to be maintained in identical versions across a number of machines.

It was originally developed under the Mach operating system, but implementations are provided with Debian[https://packages.debian.org/search?keywords=sup&searchon=names&exact=1 Debian Package: sup] (Software Upgrade Protocol implementation) & Ubuntu[https://packages.ubuntu.com/search?keywords=sup&searchon=names&exact=1 Ubuntu Package: sup] (Software Upgrade Protocol implementation) Linux distributions.