.htaccess domain forwarding issue

The following code in the .htaccess file is supposed to, among others I guess, redirect the secondary domains towards the main domain:

<ifModule mod_headers.c>
Header unset Last-Modified
</ifModule>
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
RewriteCond %{HTTP_HOST} ^secondaryDomain1.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.secondaryDomain1.com$
RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]
RewriteCond %{HTTP_HOST} ^secondaryDomain2.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.secondaryDomain2.com$
RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]
RewriteCond %{HTTP_HOST} ^secondaryDomain3.com$ [OR]
RewriteCond %{HTTP_HOST} ^secondaryDomain3.com$
RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]
RewriteCond %{HTTP_HOST} ^secondaryDomain4.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.secondaryDomain4.com$
RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]
RewriteCond %{HTTP_HOST} ^secondaryDomain5.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.secondaryDomain5.com$
RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]
RewriteCond %{HTTP_HOST} ^secondaryDomain开发者_JAVA技巧6.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.secondaryDomain6.com$
RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]
RewriteCond %{HTTP_HOST} ^secondaryDomain7.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.secondaryDomain7.com$
RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]

Unfortunately if I type www.secondaryDomain.com/index.html or www.secondaryDomain.com/directory it is not redirected towards the main domain. What has been done wrong in the .htacess file?

RewriteRule ^/?$ "http\:\/\/mainDomain\.com\/" [R=301,L]

This rewrites only URLs ending in / or nothing at all. You should use something like:

RewriteRule (.*) "http\:\/\/mainDomain\.com$1" [R=301,L,QSA]

Which redirects and preserves all path-info.

Try this:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*)$ http://mainDomain.com/ [L]
</IfModule>

I am assuming that this .htaccess file is for secondarydomain.com ...