How to show the username of whos logged in?

Function_Reference/is_user_logged_in

Is there anyway to show FIRSTNAME LASTNAME rather than username?

I managed to put the username in like this:

<?php
global $current_user;
if ( isset($current_user) ) {
    echo $current_user->user_login;
}
?>

Hello,

I am a newbie and want to implement this function in my blog.
I was hoping, that there was a plugin for that function, so that I do not have to modify files … but I couldn’t find any.

In which file(s) do I have to add the above code?
(I couldn’t find a “how to” for this …)

In which file(s) do I have to add the above code?

Where do you want it to go on your site?

Hey, this is exactly what I needed. Thanks lot moshu and krushinfo for the link and code. ??

Here is a nice example I came up with.

<?php  if (is_user_logged_in()){
global $current_user; get_currentuserinfo();
echo('Welcome, ' . $current_user->user_firstname . ' | ');
}
else {
echo "Welcome, Visitor | ";
};
?>

The user_firstname can be changed to a number of things. See: Function_Reference/wp_get_current_user