$ hydra -l username -P [path_to_wordlist] <host> <service>\
# eg. brute force login to FTP server with username "user" and password from rockyou.txt
$ hydra -l user -P /usr/share/wordlists/rockyou.txt 10.10.10.22 ftp
# OR
$ hydra -l user -P /usr/share/wordlists/rockyou.txt ftp://10.10.10.2
Additional flags
-s PORT to specify a non-default port for the service in question.
-V or -vV, for verbose output
-t n where n is the number of parallel connections to the target. -t 16 will create 16 (default) threads used to connect to the target.
