diffstat(1) on Linux
The text c5009d45bf2d, as Debian 10 (Buster) shipped it.
make histogram from diff-output
Flags it lists
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-C -
-E -
-K -
-R -
-T -
-V -
-b -
-c -
-d -
-h -
-k -
-l -
-m -
-q -
-r -
-s -
-t -
-u -
-v