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Is necessary to close a file when you only want create it? I’m supposed that it’s only necessary in case of reading or writing.
_, err := os.OpenFile(name, os.O_CREATE, 0640)
Will it work? Yes. The file will be created.
Should you do it? No. It is a bad idea in general even though you can get away with it sometimes.
Opening a file allocates resources like a file handle to your process. You should close it to free those resources. Otherwise they will be unavailable until the process dies.