xxd(1) on Linux
The text 28f4fa5a45d8, as Debian 13 (Trixie) shipped it.
make a hex dump or do the reverse.
Flags it lists
-
-C -
-E -
-EBCDIC -
-R -
-a -
-autoskip -
-b -
-bits -
-capitalize -
-d -
-e -
-h -
-help -
-i -
-include -
-o -
-p -
-plain -
-postscript -
-ps -
-r -
-revert -
-s -
-seek -
-u -
-v -
-version