Nikto is not designed as an overly stealthy tool.its current version is "Nikto 2.1.5"
Some of its key feature:-
How to use Nikto for scanning web app ?
The usage of this tool is very simple,but before doing these scanning you just need to update it.
Command in backtrack
#./nikto.pl -update (on current directory cd/pentest/web/nikto)
In kali it is.
To run a basic scan you just need to type.
#nikto -h [ip/target address]
#./nokto -h [ip/host address](in backtrack)
If you want to check different port than use
#nikto -h [target host] -p [port number]
If you want this test via proxy than you can use by this command
#nikto.pl -h [target host] -useproxy http://localhost:8080/
For help and know more options available just use.
i hope this tut will help you to use nikto scanner if any more doubt please do comment :).
Thank you for reading.