I recently had to use hashcat to verify some user credentials. Here are the commands I used:

# Salted md5 passwords (all the same salt in salt+password format):
hashcat -o found-passwords.pot -e salt.txt -m 20 -a 0 input-passwords.txt hashkiller.dic

Input file is just hashes from the database, one hash per line. I think you can put a :salt after each hash and omit the -e salt.txt from the command to use unique salts.