Hybrid attack syntax

[epixoip]

well for one, it's ?d, not $d. normally this would error out, but since your shell is interpreting $d as a string of empty variables, it's like those $d's don't even exist.

you're also missing the attack mode for both of those.

-a 6 rockyou.txt ?d?d?d?d
-a 7 ?d?d?d?d rockyou.txt