Reversing strings

strings are character arrays, first we need to understand it

Js reverse command is easy

var str="asdf";
console.log(str.reverse());

Iptables allow port to input - output

iptables -A INPUT -p tcp --dport 8181 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 8181 -j ACCEPT
iptables --flush

we will se result after run those commands