How to redirect old sites using htaccess?

Question

htaccess

I have about 5 sites from different domains go to one site (main)
How can I make any domains redirect to the main one?

RewriteEngine On
RewriteCond %{HTTP_HOST} тут что бы любой домен или поддомен
RewriteRule (.*) http://нужный-сайт.ru/$1 [R=301,L]