To be able to output warnings, error and notice messages in our modules we have to use the following interface \Magento\Framework\Message\ManagerInterface.

The best way to use it is through Dependency Injection in the constructor as follows:

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N98-Magerun

The swiss army knife for Magento

N98-Magerun is a command line utility for environments (Mac OS / Linux) that streamlines many common tasks in Magento development.

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