puts "What ip address do you want to scan?"
nmap_ip = gets.chomp
nmap_scan = system('nmap #{nmap_ip} -p 22')

#Alternative, also not working
#nmap_scan = %x<'nmap #{nmap_ip} -p 22'>

puts "#{nmap_scan}"


output gives ...

nmap -p 22

So the IP Address is not being picked up from the user input.