oclHashcat bruteforce

[krest]

yes but you need to add the ?a for each position of the password length. for example if you think the password is 6 characters then you need
?a?a?a?a?a?a

for 8 characters you want
?a?a?a?a?a?a?a?a

and so on.

you don't need the -1 unless you are using it as a variable, which looks like this
-1 ?l?u?d?s ?1?1?1?1?1?1

that does the same as the above ?a example.

more examples

http://hashcat.net/wiki/doku.php?id=mask_attack

Thanks for the reply. Now I've understood about -1 usage.
But i still don't get how to brute all possible passwords if I do not know the length of a password. Lets say I want to start from 1 charachter passwords and go to 7 charachter passwords. Do I need to use some mask file or increment option?