Bash input Question

Sorry Very new to bash.

I am trying to create a bash script to block my internet users.

It looks like this

Code:

#! /bin/bash
iptables -A FORWARD -s 192.168.1.222 -j DROP

I would like to be able for this script to ask for the IP address and ad it itself.
where I try block and an ip address and it changes the script to match.

./block 192.168.1.223 and it will block that IP

 

Take a look at the "Positional parameters" section on http://tldp.org/LDP/abs/html/othertypesv.html

 

Good tutorial xD