oathtool(1) on Linux
The text 89d550ac3501, as Debian 8 (Jessie) shipped it.
OATH one-time password tool
Flags it lists
-
--base32 -
--counter -
--digits -
--help -
--hotp -
--now -
--start-time -
--totp -
--verbose -
--version -
--window -
-N -
-S -
-V -
-b -
-c -
-d -
-h -
-v -
-w