mbuffer(1) on Linux
The text 63e2b2b1d9e6, as Debian 7 (Wheezy) shipped it.
measuring buffer
Flags it lists
-
--help -
--md5 -
--version -
-6 -
-A -
-D -
-H -
-I -
-L -
-O -
-P -
-R -
-T -
-V -
-a -
-b -
-c -
-d -
-f -
-h -
-i -
-l -
-m -
-n -
-o -
-p -
-q -
-r -
-s -
-t -
-u -
-v