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I don’t understand this part:

> Now one thing that I should have noticed was that the file size was 9 bytes

The file contains more than 9 characters. What was the author trying to say?

Probably not this simplified example.

He saw nothing print when he used 'cat' on the file. Seeing it be 9 bytes was strange because it just printed out nothing.

But it contained more than 9 bytes if you look at his example.