I don't see the point, but breaking it down:
- Read from file: <>
- Read in array context; i.e., get all lines from file: ()=<>
- Assign those read lines to $=. That's the page length for formatted output: $==()
Basically it's saying, make the format page length the size of the number of lines in file
. But just printing that doesn't really do a whole lot unless I'm missing something ...
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