"Wow! when i run the following script then hello! can be seen inside "not.txt" file after once scrip is run."
I've already questioned why you'd want to do this, you didn't answer.
"it means book assumed me as knower of perl so it didn't mentioned to write:..."
I have no idea what book you're talking about. For all I know this is explained in a previous section of the text. It's also possible that you didn't follow the books written instructions properly. I don't believe the book told you to save the perl script as not.txt, which the example script overwrites.
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