How to redirect more domains in one folder via .htaccess

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How to do 301 redirects in Apache .htaccess, PHP,ASP

Apache Web Server .htaccess file
Apache .htaccess files let you override the Web server configuration on a per-directory hierarchial basis, and are instrumental in the creation of proper 301 redirects.

Single Page Redirect:

Redirect 301 /old/url /new/url

or

Redirect Permanent /old/ur /new/url

Canonical Hostname Redirect (non-www to www):
This solution will redirect any page requested via a non-www domain to the same URL with the www domain, and as such it can be placed in the DocumentRoot of your site and will be enforced globally:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^domain\.com
RewriteRule (.*) http://www.domain.com/$1 [R=301,L]

PHP 4 and PHP 5
Single Page Redirect:

<?php
header('HTTP/1.1 301 Moved Permanently');
header('Location: http://www.new-url.com/');
?>

Canonical Hostname Redirect (non-www to www):

<?php
if (substr($_SERVER['HTTP_HOST'],0,3) != 'www') {
header('HTTP/1.1 301 Moved Permanently');
header('Location: http://www.'.$_SERVER['HTTP_HOST']
.$_SERVER['REQUEST_URI']);
}
?>

Active Server Pages (ASP)
Single Page Redirect:

<%
Response.Status="301 Moved Permanently"
Response.AddHeader='Location','http://www.new-url.com/'
%>

Canonical Hostname Redirect (non-www to www):
This code should be inserted into a global include file or any ASP script which is executed for every page on the site before the page output begins:

<%
If InStr(Request.ServerVariables("SERVER_NAME"),"www") = 0 Then
Response.Status="301 Moved Permanently"
Response.AddHeader "Location","http://www."
& Request.ServerVariables("HTTP_HOST")
& Request.ServerVariables("REQUEST_URI")
Response.End
End if
%>