How to remove www from all domains?

Question

Apache HTTP Server

Hello!
Several domains look into the directory, how to redirect all domains from www not without www using htaccess?

Answer 1

get out of .htaccess only from the site where you implemented such a redirect

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

From all sites you need to look towards the Apache config files

<VirtualHost *:80>
    ServerAlias example.com
    RedirectMatch permanent ^/(.*) http://www.example.com/$1
</VirtualHost>