a fast, versatile, remote (and local) file-copying tool
-f, --filter=RULE
       This option allows you to add rules to selectively exclude certain files from the list of files to
       be transferred. This is most useful in combination with a recursive transfer.

       You may use as many --filter options on the command line as you like to build up the list of files
       to exclude.  If the filter contains whitespace, be sure to quote it so that the  shell  gives  the
       rule  to  rsync as a single argument.  The text below also mentions that you can use an underscore
       to replace the space that separates a rule from its arg.

       See the FILTER RULES section for detailed information on this option.
source manpages: rsync