gen(1) on Linux
The text bd4e20c0d556, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it. The page shows this text now.
program to generate test files of radio transmission modulation
Flags it lists
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-a -
-d -
-p -
-s -
-t -
-z