Change wordpress site URL

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In a working wordpress site /wp-admin can help in changing site URL. However if a wordpress site is no longer functioning because site URL has changed then use following steps to change wordpress site URL use:

1. Edit wp-config.php and append

   define('WP_HOME','http://example.com');
   define('WP_SITEURL','http://example.com');

   Note that this is not ideal as this fixes the site URL and later this cannot be changed via settings page. Updating wp_options database table option_name siteurl and home is better.

2. Search for old URL everywhere using 'grep -r old-url *' and replace using

   find . -type f -exec sed -i "s/old-url/new-url/g" '{}' \;

   in all sub-folders and files recursively.

Refer https://codex.wordpress.org/Changing_The_Site_URL

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