xxd(1) on macOS
The text e6696f590a94, as Mac OS X 10.5.5, Mac OS X 10.5.4, Mac OS X 10.5.3, Mac OS X 10.5.2, Mac OS X 10.5.1, Mac OS X 10.5 shipped it.
make a hexdump or do the reverse.
Flags it lists
-
-E -
-EBCDIC -
-a -
-autoskip -
-b -
-bits -
-h -
-help -
-i -
-include -
-p -
-plain -
-postscript -
-ps -
-r -
-revert -
-s -
-seek -
-u -
-v -
-version