The WP-CLI command line tool is essentially a handy application to run various WordPress tasks. Download the WP-CLI command line tool into the WordPress root folder using CURL or WGET.
curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
Check if the tool is working.
php wp-cli.phar --info
php wp-cli.phar search-replace 'http://www.olddomain.com' 'http://www.newdomain.com'
This will save you numerous hours and give you some peace of mind!
Alternatively, you can use the option update commands below to change the URL.
wp option update home 'http://example.com' wp option update siteurl 'http://example.com'
Since people have multiple plugins installed and setup, you want to test this on a staging environment before running it on a production site.