rsync -option explaination?

Question

I've seen the switches below on an rsync script and I just wondered if someone could break them down for me...

rsync --chmod=ugo=rwX

ugo? rwX (read-write-Execute - why the capitalisation on Execute?)

--chmod=CHMOD           affect file and/or directory permissions

Also what is "don't cross filesystem boundaries" for the -x option?

-x, --one-file-system   don't cross filesystem boundaries

Many Thanks

Answer 1

It is the syntax of chmod and has nothing to do with rsync options: Set user (u), group (g) and other (o) access to read (r), write (w), and if for the existing file or directory already set, then add execute (X) rights.

As you can mount different file systems, you could limit rsync to stay on one file system, for this is the -x option.