hexdump(1) on Linux
The text 3a6a73b247c4, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.2 (Rex), Debian 1.1 (Buzz) shipped it.
ascii, decimal, hexadecimal, octal dump
Flags it lists
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-b -
-c -
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-n -
-o -
-s -
-v -
-x