Adding a logging function when debugging

When debugging, it might be necessary to add some logs.
Here is a simple way to add a logging function in your code.
Warning :
This is not supposed to stay in your code and is only for debugging purpose.
There are better and more integrated ways of doing it

/**
 * @param $str
 */
private function log($str)
{
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    /** @var \Magento\Framework\Filesystem\DirectoryList $directory */
    $directory = $objectManager->get('\Magento\Framework\Filesystem\DirectoryList');
    $rootPath = $directory->getPath(\Magento\Framework\App\Filesystem\DirectoryList::VAR_DIR);
    $logger = new \Zend\Log\Logger();
    $writer = new \Zend\Log\Writer\Stream($rootPath . '/log/zendlog.log');
    $logger->addWriter($writer);
    $logger->debug($str);
}

Searching files on linux

When debugging and application, it is very common to need to search for files on the system.
You might need to search for a file named in a certain way or you might need to search for file that contain a specific word or specifics characters.

Here is how to search a file by its name :

find . -name *js-translation.json*

Here, we are searching for a file having « js-translation.json » in the name, recursively in the current folder.

And here is how to search a file with a character phrase or pattern :

grep -Hrn -A 2 -B 2 'translation' .

Here we are searching files having « translation » in the content, also recursively in the current folder.