I'm unsure why modifying $_ doesn't change the file

• Your opening the file write-only (O_WRONLY),
• attempting to slurp the entire file ($/=""),
• Testing to see if it contains some text return by $get{'post'} (whatever that is!)
• Replacing everything in the file (if the file ends with a newline) with whatever is in the variable $post.
• Then closing the file without having re-written the (possibly) modifed data back out

Still unsure why? :^).

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