rrdcached(1) on Linux
The text ac61122b92cc, as Debian 8 (Jessie) shipped it.
Data caching daemon for rrdtool
Flags it lists
-
-B -
-F -
-P -
-b -
-f -
-g -
-j -
-l -
-m -
-p -
-s -
-t -
-w -
-z