rrdcached(1) on Linux
The text 4cba86b30863, as Debian 10 (Buster) shipped it.
Data caching daemon for rrdtool
Flags it lists
-
-B -
-F -
-G -
-L -
-O -
-P -
-R -
-U -
-V -
-a -
-b -
-f -
-g -
-group -
-j -
-l -
-m -
-o -
-p -
-s -
-t -
-user -
-w -
-z