fits-flip-endian(1) on Linux
The text 0c23c961b664, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
Endian swapping of FITS binary tables.
Flags it lists
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-e -
-i -
-o -
-s