Yeah, however --C, LISP and Perl are not fads and even though tech changes rapidly there are some tech like C programming that is a mainstay. I would say a hacker needs a good understanding of C/C++,Python, Perl, Java and LISP. For hackers, learning Perl is good practically as it is the language used on many active web pages. Even though a hacker might not use any Perl code it is important to know how it should be read. And just to clarify I could be talking about grey hat and white hat hackers here just so I don't get banned.

However, that latter point is tricky as Python has clearer to read syntax. Perl leaves more room for artistic programming expression and 'there are many ways to skin a cat' which can make it difficult to read. Perl is basically like sed/awk but on steroids that is what makes it so good for tools like libwhisker/nikto for parsing through port 80 web insecurities.

I see you used google chart statistics and while obviously dramatic I'm sorry to say they are not as authorative as the Tiobe index.

Perl is still hanging on within the top 20 most popular programming languages which is pretty impressive given how long it has been around. LISP is not even on the list but I would learn it before some of the more fly-by-night trendy programming languages on there as it helps you think differently as a hacker. LISP is a challenging language to learn and requires more from the hacker with each interaction. For a hacker this is excellent news because it means that a continuous effort is being placed on their developing skill. The advantage of using LISP is that it has one result, it will make you a better hacker in the long run even though you it is unlikely to be used regulary. If you don't believe me about LISP read the book The Structure and Interpretation of Computer Programs it is a computer science textbook by Massachusetts Institute of Technology (MIT) professors Harold Abelson and Gerald Jay Sussman with Julie Sussman.

It will still make you a grand master computer programmer today even though written in 1985 and updated in 1996. You know people still read K&R The Programming Language and use C programming too don't you know ?

P.S. Sorry, for going off topic with LISP but this guy already dived in head deep with making an Oscillograph with PERL so I decided to make this post for other readers who are interested in cybersecurity and also make the moral of the story that trendy new shiny languages are not always better although I am not denigrating Python here.