Thanks for the answer but if I haved install MySQL using apt-get, write mysql in the shell would work (my S.O. is Ubuntu) but I use the MySQL which comes with XAMPP and I was asking a way to see the information the user will save on my pages using the shell.
I was thinking something like this on some of the folders of /opt/lampp.
And then start the command line of mysql. Also I was thinking something like.
With the same expected result.
AGAIN THANKS FOR YOUR ANSWER