Changed --skip-empty-dirs (-k) to --prune-empty-dirs (-m) and

improved the docs a bit more, including documenting how "protect"
filtering affects empty dirs.

rsync.yo

@@ -349,7 +349,7 @@ to the detailed description below for a complete description.  verb(
      --partial               keep partially transferred files
      --partial-dir=DIR       put a partially transferred file into DIR
      --delay-updates         put all updated files into place at end
- -k, --skip-empty-dirs       skip empty directory chains
+ -m, --prune-empty-dirs      prune empty directory chains from file-list
      --numeric-ids           don't map uid/gid values by user/group name
      --timeout=TIME          set I/O timeout in seconds
  -I, --ignore-times          don't skip files that match size and time
@@ -1386,21 +1386,35 @@ See also the "atomic-rsync" perl script in the "support" subdir for an
 update algorithm that is even more atomic (it uses bf(--link-dest) and a
 parallel hierarchy of files).
 
-dit(bf(-k, --skip-empty-dirs)) This option tells the receiving rsync to get
+dit(bf(-m, --prune-empty-dirs)) This option tells the receiving rsync to get
 rid of empty directories from the file-list, including nested directories
 that have no non-directory children.  This is useful for avoiding the
 creation of a bunch of useless directories when the sending rsync is
 recursively scanning a hierarchy of files using include/exclude/filter
-directives.  This also affects what directories get deleted when a delete
-option was specified (but keep in mind that excluded files are also
-protected from deletion).
+rules.
+
+Because the file-list is actually being pruned, this option also affects
+what directories get deleted when a delete is active.  However, keep in
+mind that excluded files and directories can prevent existing items from
+being deleted (because an exclude hides source files and protects
+destination files).
+
+You can prevent the pruning of certain empty directories from the file-list
+by using a global "protect" filter.  For instance, this option would ensure
+that the directory "emptydir" was kept in the file-list:
+
+quote(    --filter 'protect emptydir/')
 
 Here's an example that copies all .pdf files in a hierarchy, only creating
 the necessary destination directories to hold the .pdf files, and ensures
 that any superfluous files and directories in the destination are removed
-(due to a hide filter on non-directories being used instead of an exclude):
+(note the hide filter of non-directories being used instead of an exclude):
+
+quote(     rsync -avm --del --include='*.pdf' -f 'hide! */' src/ dest)
 
-quote(     rsync -avk --del --include='*.pdf' -f 'hide! */' src/ dest)
+If you didn't want to remove superfluous destination files, the more
+time-honored options of "--include='*/' --exclude='*'" would work fine
+in place of the hide-filter (if that is more natural to you).
 
 dit(bf(--progress)) This option tells rsync to print information
 showing the progress of the transfer. This gives a bored user