new to hashcat trying to learn

[ciccio17]

hi everyone, i 'm reading around and not finding any help.i have this situation:
hashcat -a 3 -m 2500  prova.hccapx  -1 ?l?d  ?1?1?1?1?1?1?1?1 .
i know my password is  lower alpha numeric 8 char long. 
i  also know that the 2 and 4 char are equal .  so now how i can set  hashcat to use the same letter or number at  position 2 and 4 ? i know i can do it manualy but that way i need start hashcat 36 time.

[winxp5421]

One possible solution would be to create a Maskfile

hashcat -a 3 -m 2500 Prova.hccapx -1 ?l?d masks.hcmask

cat masks.hcmask
?1a?1a?1?1?1?1
?1b?1b?1?1?1?1
?1c?1c?1?1?1?1
...

[philsmd]

please remember that the custom charsets must be set within the hashcat mask file:

Code:

hashcat -m 2500 -a 3 -w 3 Prova.hccapx masks.hcmask

the masks.hcmask file is this one:

Code:

?l?d,?1a?1a?1?1?1?1
?l?d,?1b?1b?1?1?1?1
?l?d,?1c?1c?1?1?1?1
?l?d,?1d?1d?1?1?1?1
?l?d,?1e?1e?1?1?1?1
?l?d,?1f?1f?1?1?1?1
?l?d,?1g?1g?1?1?1?1
?l?d,?1h?1h?1?1?1?1
?l?d,?1i?1i?1?1?1?1
?l?d,?1j?1j?1?1?1?1
?l?d,?1k?1k?1?1?1?1
?l?d,?1l?1l?1?1?1?1
?l?d,?1m?1m?1?1?1?1
?l?d,?1n?1n?1?1?1?1
?l?d,?1o?1o?1?1?1?1
?l?d,?1p?1p?1?1?1?1
?l?d,?1q?1q?1?1?1?1
?l?d,?1r?1r?1?1?1?1
?l?d,?1s?1s?1?1?1?1
?l?d,?1t?1t?1?1?1?1
?l?d,?1u?1u?1?1?1?1
?l?d,?1v?1v?1?1?1?1
?l?d,?1w?1w?1?1?1?1
?l?d,?1x?1x?1?1?1?1
?l?d,?1y?1y?1?1?1?1
?l?d,?1z?1z?1?1?1?1
?l?d,?10?10?1?1?1?1
?l?d,?11?11?1?1?1?1
?l?d,?12?12?1?1?1?1
?l?d,?13?13?1?1?1?1
?l?d,?14?14?1?1?1?1
?l?d,?15?15?1?1?1?1
?l?d,?16?16?1?1?1?1
?l?d,?17?17?1?1?1?1
?l?d,?18?18?1?1?1?1
?l?d,?19?19?1?1?1?1

[ciccio17]

thanks guys, working good!