In article <CAKHUCzwYRsNz6qM9kwJZNByqwRCA9r+0Rp4B92-t0t2H499syw@xxxxxxxxxxxxxx> you write: >to ask - I can find an implementation of rsync easily enough, but I can't >find the specification published as an open standard anywhere - do you know >where I can find it? It was originally described in this 1996 tech report from the Australian National University: https://www.andrew.cmu.edu/course/15-749/READINGS/required/cas/tridgell96.pdf The design and motivation are described in more detail in Andrew Tridgell's 1999 PhD Thesis: https://openresearch-repository.anu.edu.au/bitstream/1885/144682/2/b20302253_Tridgell_A.pdf If you're wondering if there's an RFC for it, nope. RFC 5781 specifies the rsync: URI but refers back to http://rsync.samba.org/ for details on rsync. I don't suppose anyone would object if we made an RFC out of the spec but given that the tech report, thesis, and multiple implementations are widely available without restriction (other than GPL on some of the code) it doesn't seem worth a lot of effort. R's, John