rr is a basic command-line utility designed to
retain/recall file and directory paths. This is
done by treating the filename itself as a unique
key to be referenced for future rr program calls.
The purpose of this is to assist the user in
shorthand typing and/or not having to remember
arbitrary full paths. So, for example,
"/etc/httpd/conf/httpd.conf" can be referenced as
"// httpd.conf" in daily operations.