e2ln(1) on Linux
The text a2cbf3a35ad8, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
create hard links on an ext2 filesystem
Flags it lists
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-f -
-s -
-v