Unlike many other small/big letter combos, this one has the recursive
version attached to the lowercase letter.
b /dev/block-device-to-create mode user group - major:minor
b+ /dev/block-device-to-[re]create mode user group - major:minor
C /target/to/create - - - - /source/to/copy
-x /path-or-glob/to/ignore - - - - -
-X /path-or-glob/to/ignore/recursively - - - - -
+x /path-or-glob/to/ignore/recursively - - - - -
+X /path-or-glob/to/ignore - - - - -
r /empty/dir/to/remove - - - - -
R /dir/to/remove/recursively - - - - -
z /path-or-glob/to/adjust/mode mode user group - -