Scenario:
Old Site: www.domain.com/blog
Path: /home/domain/public_html/blog
New Site: www.domain.com (Assume the site is empty)
Path: /home/domain/public_html
In order to move the WordPress account manually without any plugin, you may choose to use FTP to perform download and upload.
Folder/File:
1. Download your web file/folder from /home/domain/public_html/blog to your PC.
2. Reupload those file/folder back to the /home/domain/public_html.
3. If you using Permalink and having mod_rewrite rule, you may edit your .htaccess file from your local PC from,
RewriteEngine On RewriteBase /blog/ RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /blog/index.php [L]
To,
RewriteEngine On RewriteBase / RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L]
4. Upload the .htaccess file to /home/domain/public_html.
Database:
1. You may backup through SSH, PHPMyAdmin or any other method.
2. Download the backup file through FTP.
3. Open Notepad, find and replace from www.domain.com/blog to www.domain.com.
4. Upload the database back to the server.