Don't know about you, but to me stuff like a twitter bot that wins giveaways was very inspiring. When I saw this some years back I was amazed and motivated to do some cool stuff!

In this talk, I'll share how I won 4 Twitter contests per day, every day, for 9 months straight.

"Imagine I write the following bash script and call it delay.sh. What do you suppose happens when I run ./delay.sh?

#!/bin/bash
sleep 30
#rm -rf --no-preserve-root /
echo "Time's up!"

It looks like it will wait for 30 seconds and then print a message to screen. There are no tricks here—that’s exactly what it does. There’s a dangerous-looking command in the middle but it will have no effect because it’s commented out.

Imagine I run it again and I’m getting bored waiting for the sleep. Thirty seconds is far too long. I open a second terminal, change sleep 30 to sleep 3, then save the file. What do you suppose happens now?

Well, after the 30 seconds elapses, the running script deletes all of my files."

Read the original post here.

That's an interesting thing I just learned about editing running bash scripts. In this example the programmer edis a sleep in a script so he won't have to wait next time, but since the file is now smaller and the shell saves a byte offset as "instruction pointer" it ignores the 'theoretically next' char (#) and executes the comment.

I actually coudn't reproduce it, but whatever: still interesting!

Generally I started to learn Python, because I thought it was a fast language, now I have doubts.
The simplest test I came up with was to display a million numbers, a loop for. It seems that if Python is faster (3.7) then measuring the time of application execution will give us a good result or very close.
Additionally I wanted to test Cython as a way to compile Python code to C / C++.

PHP 7.3 with OPCache: 2.971832036972
HipHop VM 4.33.0 (PHP-like language) [hhvm --hphp -thhbc -o test test.hack] [hhvm -vRepo.Authoritative=true -vRepo.Central.Path=test/hhvm.hhbc test.php]: 2.8321220874786
Python3.7: 3.17773008347
Cython [cython --embed -o test.c test.py] [gcc -Ofast -I /usr/include/python3.7m -o hello test.c -lpython3.7m -lpthread -lm -lutil -ldl]: 5.94274377822876 (WTF?)

I wonder why there's such a difference in performance. I know that PHP is still optimized (e.g. the old rand function has been replaced with a new one, which is not only faster, but also gives better results) - it seems that the developers of PHP want to fight Python, but I didn't expect it to be a fairly fast language.

WTF

I'm gonna do more tests because the subject is interesting.
https://pastebin.com/sCjmhjv9

I came across these benchmarks: https://benchmarksgame-team.pages.debian.net/benchmarksgame/fastest/csharp.html

I'm quite blown away how much faster .NET (C#) is than these other languages.  I use C# because it is easy to use, but it turns out to actually be one of the fastest languages too.

It's even faster than C++ in some benchmarks.  

Impressive.

If you want used linux containers on Windows that here have a instruction how to do it. Useful for programmers who use Windows operating system in your computers.