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The "*,cover" syntax in a gitignore file uses a regular expression to tell Git to ignore all files with names that end in ".cover", regardless of the file extension or any other characters that come before ".cover".

For example, if your project generates coverage reports with filenames like "myfile.js.cover", "mymodule.py.cover", or "test_results.cover", adding "*cover" to your gitignore file would exclude all of these files from version control.

The asterisk ("*") serves as a wildcard character that matches any string of characters, while the comma (",") separates different patterns in the same line. The combination of the asterisk and ".cover" indicates that Git should ignore any files that end in ".cover", regardless of what comes before it.