In this article I look at how to find all prime numbers below a certain positive number N, as well as their sum. We do not know how primes are distributed. There is no function, which reliably finds all primes less then a large natural number. However, we do known an algorithm, ...

We have stored more and more data, sometimes logins, passwords and whole databases, by popular cloud storage services today. On one hand, keeping files with them seems like a good idea. You get access to your files on demand, on any device you connect to service with, from ...

To large degree this article is a result of my observations on people's struggles related to compressing files, possibly also directories, with tar command line utility efficiently and safely. Most of the time using tar on its own causes no difficulty. Problems crop up ...

If you are a website admin or owner you probably scan your HTTP server's logs in search of interesting, or perhaps dangerous, entries from time to time. When doing so, you might have come across a GET or POST HTTP request (or some its variation) which looks like the one ...