Go to WordPress Installation (e. g. wordpress/)
cd wordpress/
Download WP Command Line Interface
curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
Dry-Run
php wp-cli.phar search-replace www.ALTEURL.de www.NEUEURL.de --recurse-objects --precise --dry-run
Search & Replace URLs
php wp-cli.phar search-replace www.ALTEURL.de www.NEUEURL.de --recurse-objects --precise