checksum negotiation list, the list is silently ignored unless it contains the
string "FAIL".
+Use bf(rsync --version) to see the default checksum list.
+
The use of the bf(--checksum-choice) option overrides this environment list.
dit(bf(-x, --one-file-system)) This tells rsync to avoid crossing a
negotiation list, the list is silently ignored unless it contains the string
"FAIL".
+Use bf(rsync --version) to see the default compress list.
+
dit(bf(--compress-level=NUM)) Explicitly set the compression level to use
(see bf(--compress)) instead of letting it default. If NUM is non-zero,
the bf(--compress) option is implied.