PLEASE HELP!_MASK with 8-20 abcABC123...

[mastercracker]

how to make a mask with the parameters of minimum 8 characters to maximum 20 charakters with various digits and abc../ABC.. - but WITHOUT the -a function and all the special signs !"§$%....

I guess that the "without -a function" you mean ?a that includes all characters.  Everything is in the wiki, specify the characters you want in a custom charset and include the custom charset in the mask:

Code:

--increment --increment=8 --increment-max=20 -1 ?d?u?l ?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1

The keyspace, however, is way too big.  You will be lucky if you can finish length 8 so forget about the other length.

EDIT:

And also, I just included the parameters related to the bruteforce, you would need to specify -a 3 to tell hashcat to use the bruteforce mode, -m to tell which algo you are cracking and an hashlist...