How to create a tunnel with a unix shell and netcat

This is a study I made which explains the way to create a tunnel using a unix shell and netcat.
Scenario:
computer-one it’s the server and the command input.
computer-two it’s the client and the command output.

Go to computer-one as root where you have netcat and run the command:

1) computer-one# nc -l -p 55555

Go to computer-two as normal user and execute this script on the shell
where computer-one_IP is the IP ADDRESS of the computer-one

2) computer-two$ exec 5<>/dev/tcp/computer-one_IP/55555 

Execute also this string on computer-two as normal user:

3) computer-two$ cat <&5 | while read line; do $line 2>&5 >&5;done

Now you can write commands on computer-one and see the output result on computer-two