extcheck(1) on Linux
The text c1eaf74e648f, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it. The page shows this text now.
check hierarchical ext(5) files for global node connectivity and summarize number of fets, nodes, etc.
Flags it lists
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-C -
-R -
-S -
-T -
-c -
-p -
-r -
-s