.htaccess redirect all pages to new domain

The below answer could potentially cause an infinite redirect loop...

Here, this one redirects everything after the domain name on the URL to the exact same copy on the new domain URL:

RewriteEngine on 
RewriteRule ^(.*)$ http://www.newdomain.com/$1 [R=301,L]

www.example.net/somepage.html?var=foo

redirects to:

www.newdomain.com/somepage.html?var=foo

May be like this:

Options +FollowSymLinks
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^OLDDOMAIN\.com$ [NC]
RewriteRule ^(.*)$ http://NEWDOMAIN.com [R=301,L]

Just to clarify, after removing the hosting redirect which was in the way, my original solution also works:

RewriteEngine On
RewriteRule ^(.*)$ http://newdomain.com/ [R=301]

I've used for my Wordpress blog this as .htaccess. It converts http://www.blah.example/asad, http://blah.example/asad, http://www.blah.example2/asad etc, to http://blah.example/asad Thanks to all other answers I figured this out.

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} !^YOURDOMAIN\.example$ [NC]
RewriteRule ^(.*)$ https://YOURDOMAIN.example/$1 [R=301,L]

RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{HTTP_HOST} ^olddomain.com$ [OR]
  RewriteCond %{HTTP_HOST} ^www.olddomain.com$
  RewriteRule (.*)$ http://www.newdomain.com/$1 [R=301,L]
</IfModule>

This worked for me