How to redirect a file in a directory to another subdomain in .htaccess?

Question

htaccess

Hello everyone, please help. Need to redirect
https://old.site.com/Gallery2/index.php to https://new.site.com/Gallery2/index.php
I know I need to create a .htaccess file in the folder (Gallery2 directory), but what to write there is a mystery to me.

Thanks in advance!

Answer 1

FILE /Gallery2/.htaccess

RewriteEngine On

RewriteCond %{HTTP_HOST} ^old\.site\.com$ [NC]
RewriteRule ^index\.php$ https://new.site.com/Gallery2/index.php [R=301,L]