How to use myhost.com/username in codeigniter?

Edit application/config/routes.php
add following line of code

$route['(.*)'] = "welcome/index/$1";  

Edit your welcome.php controller as follows

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Welcome extends CI_Controller {
	public function index($username)
	{
		//$this->load->view('welcome_message');	
		echo "Username is ".$username;
	}	
}

you need to write .htaccess file for removing the index.php file from your url

<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /cv_bank/

    #Removes access to the system folder by users.
    #Additionally this will allow you to create a System.php controller,
    #previously this would not have been possible.
    #'system' can be replaced if you have renamed your system folder.
RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ /cv_bank/index.php?/$1 [L]

    #When your application folder isn't in the system folder
    #This snippet prevents user access to the application folder
    #Submitted by: Fabdrol
    #Rename 'application' to your applications folder name.
RewriteCond %{REQUEST_URI} ^application.*
RewriteRule ^(.*)$ /cv_bank/index.php?/$1 [L]

    #Checks to see if the user is attempting to access a valid file,
    #such as an image or css document, if this isn't true it sends the
    #request to index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /cv_bank/index.php?/$1 [L]

</IfModule>

<IfModule !mod_rewrite.c>
    # If we don't have mod_rewrite installed, all 404's
    # can be sent to index.php, and everything works as normal.
    # Submitted by: ElliotHaughin

    ErrorDocument 404 /index.php
</IfModule>   

you can now test in your browser by typing http://localhost/cv_bank/alex/. Here alex is username. You can see User name is alex in your browser.

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About Zahidul Hossein Ripon

Zahidul Hossein Ripon a Bangladesh national, born in 1983 did Bachelor of Science in Computer Science and Engineering. At present, Mr. Ripon is working as a Managing Director in Coraltech Solutions. Before working with Coraltech Solutions, he worked in different reputed ICT industries in Bangladesh from year 2007. Mr. Ripon is one of the Associate Member of Bangladesh Computer Society. Mr. Ripon attended couple of Conference and Training, Seminars and events of ICT in Bangladesh and abroad. He is one of the co-author of few number of research publications in international scientific journals and proceedings.
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