``The more I write code and design systems, the more I understand that many times, you can achieve the desired functionality simply with clever reconfigurations of the basic Unix tool set.''
I am glad he figured that out. Unix contains a lot of useful commands and functions. Every programmer would do well to learn them, so they can use them when needed.
What also helps a lot is knowing your programming language well. By that, I mean not just the standard library, but also the fundamentals of the language. Know how things fit together, which things are efficient and which things are costly, and how to design good APIs in that language. Better yet: know this for multiple languages - different languages for different tasks. It's easy to learn a new programming language when you already know how to program, and doing so will provide you with new insights, so go ahead and learn another language.
It is also useful to know tools and libraries that aren't a standard part of the operating system. Of course, there are very many of those and learning them all might be a bit much. Still, knowing a handful and having heard of others can help a lot. No need to write, debug, and maintain your own code for parsing CSV, XML, YAML, or whatever the file format of the season is. Beware of bugs and misfeatures, though. Many libraries, even commonly used ones, contain bugs. Many libraries also contain choices that may or may not be a good idea for what you want to do.
All in all, you can get a long way by just knowing what other people have already done for you. Thanks to free software, you can often use this work in your projects. The world wide web has made it fairly easy to find things that you may use. A lot of software can be made by taking a bunch of libraries and writing some code to stitch it together and make it do stuff. Or, as Mr. Dziuba found out, by mixing together some command-line tools. I am glad he is discovering the strengths of Unix and getting excited enough about them to tell the world about it.
Stitching things together from existing components is not all there is to programming, however. You can go a long way doing just that, and many people make a living that way, but there are some things which are best solved or can only be solved by thinking hard and coming up with some clever code to do exactly the right thing. And somebody needs to write those tools and libraries, too. Compared to putting some existing components together, it's hard work for small results, but I find this to be the most rewarding part of programming. You're really coming up with something new here, making something clever and useful that wasn't available before.