magento 2 composer install guide code example
Example 1: install magento 2 using composer
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composer create-project --repository-url=https://repo.magento.com/ magento/project-community-edition <install-directory-name>
Example 2: install magento 2 command line composer
composer create-project --repository-url=https://repo.magento.com/ magento/project-community-edition .