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Re: rsync error -- "Protocol incompatibility" Why?

On 05/28/2018 08:08 AM, David wrote:
On 28 May 2018 at 22:47, Richard Owlett <rowlett@xxxxxxxxxxx> wrote:

But that raises another question.
Why does error message identify a protocol problem after having correctly
identified the problem as "No such file or directory".

man rsync says:
        0      Success
        1      Syntax or usage error
        2      Protocol incompatibility

An *exit value* (aka exit status) is an entirely
different concept to an "error number".

Exit status is partially explained here:

The exit status = 2 mentioned in the man page has nothing
to do with the 2 in the error message
"rsync: change_dir "/media/root/drescued_commo" failed: No such file
or directory (2)"

The 2 in that message is a reference to errors reported by the standard
library of the C programming language, as explained here:

Thank you. One of those things a non-programmer has to crash into.
My formal programming background is CORC, CUPL, and a dash of FORTRAN (of a similar vintage).