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I looked at the table of contents and I am guessing it has many handy tricks and command line examples of already public tools. Doesn't look like its should be as costly as 19$. Would you like to bring it down to one-digit costs ?

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If you want it today, it's $0 if you go here: https://gumroad.com/l/the_cyber_plumbers_handbook/hackernews...

I'm still trying to find a fair price for it, not ready to bring it down to single digits just yet.

I tried to download it, but it looks like your promo code expired.

As stated in the original post, it was only valid for 2 days through May 19. If you're a student, you can still get it for free. Just checkout the website for details https://cph.opsdisk.com

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