net2kiss(8) on Linux
The text ea74732845a2, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
convert a network AX.25 driver to a KISS stream on a pseudo-tty
Flags it lists
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-a -
-f -
-i -
-s -
-v -
-z