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sed book This is the world's best introduction to sed - the superman of UNIX stream editing. Originally I wrote this introduction for my second e-book, however later I decided to make it a part of the free e-book preview and republish it here as this article. Introduction to sed Mastering sed can be reduced to...
Testling now has moved to Testling-CI Don't use anything described below as it doesn't work anymore All questions about Testling-CI: feedback@browserling.com We have amazing news at Browserling. We just launched a new product called Testling! Testling is automated cross-browser JavaScript testing tool. You write the...
Take a look at this Perl regular expression: perl -lne '(1x$_) =~ /^(11+?)\1+$/ && print "$_ is composite"' This regular expression matches only the composite numbers (and doesn't match prime numbers). Can you figure out how it works? I'll give the explanation below but try to figure it…
Today is 4 years since I and my co-founder James Halliday have been working at Browserling Inc. I thought I'd share what I think are the top 10 inventions at our company. The first two choices are obvious. They're our products Browserling and Testling. The next eight choices are useful and popular open source…
As you all may know, I watched and posted my lecture notes of the whole MIT Introduction to Algorithms course. In this post I want to summarize all the topics that were covered in the lectures and point out some of the most interesting things in them. Actually, before I wrote this article, I had started writing an...
This is just amazing. In 20 lines of node.js code and 10 minutes of time I was able to write a HTTP proxy. Take a look: var http = require('http'); http.createServer(function(request, response) { var proxy = http.createClient(80, request.headers['host']) var proxy_request =...
I was just watching a friend of mine work with git, and he'd always type all the git commands in full, like git status and git push. I realized that he must not be the only one to do so, so I decided to write this quick blog post and encourage everyone to create Huffman coded aliases for the most commonly used...
I just had my minute of fame! I was just interviewed by Fog Creek on their development blog. Fog Creek is Joel Spolsky's company. We talked about how I got into software development, what I currently do, my current setup and my favorite books. I've been a lifetime fan of Fog Creek Software and it just feels so great…
Buy it now for just $19.99 Hello everyone! I have awesome news – I just wrote my first e-book ever. It's called Awk One-Liners Explained and it's based on the Awk One-Liners Explained article series that I wrote here on my blog a few years ago and that has been read over 2,000,000 times. I went through all the...
A while ago I had an on-site job interview at Google. The position I was interviewing for was a Google SRE. SRE stands for Site Reliability Engineering. Site reliability engineers (SREs) are both software engineers and systems administrators, responsible for Google's production services end-to-end. I interviewed…
I love Perl because of its expressiveness. You can write incredible code and it feels just so natural compared to other languages. Here are 8 secret Perl operators that I often use. Only one of them is a real operator (first one). The others are syntactic tricks that make them look like operators but they are not…
The `ldd` utility is more vulnerable than you think. It's frequently used by programmers and system administrators to determine the dynamic library dependencies of executables. Sounds pretty innocent, right? Wrong! In this article I am going to show you how to create an executable that runs arbitrary code if it's...
Hey everyone, I just pushed 30 of my projects to GitHub. I realized that all the projects were scattered across my blog and there was no central repository. So I took time to organize them, write documentation, and uploaded them to GitHub. I did all of these projects for fun and to learn better programming. You…
Hi all. I am starting a new article series called Vim Plugins You Should Know About. As the title suggests, this series is going to be about Vim plugins that you should know about and be using. The first article in this series will be about one of my favorite plugins called surround.vim. So what is surround.vim plugin?
I just finished watching the last lecture of MIT's "Introduction to Algorithms" course. Having a great passion for all aspects of computing, I decided to share everything I learned with you. This is the first post in an article series about this course. As I wrote earlier, I am very serious about watching video...
Here is something neat that I hacked together – a `top' like Python program called Hacker Top that allows you to follow Hacker News from a UNIX terminal! Hacker News has become the 2nd source for news after programming.reddit for me. I have a couple of ideas for a startup myself and the tips I get from Hacker News...
Busy Beaver puts another one on the Turing Machine's tape (image from the book The New Turing Omnibus). The busy beaver problem is a fun theoretical computer science problem. Intuitively, the problem is to find the smallest program that outputs as many data as possible and eventually halts. More formally it goes…
I have extended my xgoogle library with a Python module for Google Translate. The new module is called "xgoogle.translate" and it implements two classes - "Translator" and "LanguageDetector". The "Translator" class can be used to translate text. It provides a function called "translate" that takes three arguments -...
I decided I wanted to get better at JavaScript. I've been programming in it for a while but I never really developed any good skills in it. I was just mostly copy pasting examples together and adjusting code to get it working. I recently found a bunch of really good programming video lectures on JavaScript and…
As everyone already knows, Google released a new open-source web browser called Chrome. Having interest in code reuse, I downloaded the source code and examined all the open-source libraries used. Google Chrome browser shows excellent example of code reuse. I found that they use at least 25 different software...
A part of being a great programmer is having your personal code library. With a personal code library I mean a repository of code that you have an intimate knowledge of and that you can reuse quickly. If you are a C programmer, you don't want to reimplement linked lists, trees, various utility functions, macros and...
Here's another great lecture from Google Tech Talks. This lecture is given by Neil Daswani, who has a Ph.D. from Stanford and currently works at Google as a security engineer. He is also an author of a book titled "Foundations of Security: What Every Programmer Needs to Know", which teaches you state-of-the-art...
I found a really nice video lecture on JavaScript. I'm a JavaScript journeyman myself so I decided to review it to learn something new. I have written about JavaScript in the past -- the previous post on JavaScript was "Learning JavaScript through Video Lectures". This lecture is given by JavaScript guru Doug...
I was reading about vim the other day and found out why it used `hjkl` keys as arrow keys. When Bill Joy created the vi text editor he used the ADM-3A terminal, which had the arrows on hjkl keys. Naturally he reused the same keys and the rest is history. Here is how the `hjkl` keys looked. ADM-3A keyboard's hjkl…
In this post I'll cover a lecture on MySQL performance tuning. This lecture is given by Jay Pipes. Jay works at MySQL and has written a book on MySQL. It's called Pro MySQL and it covers intermediate and advanced features of the database. He also has an interesting blog, which I am long subscribed to - Jay Pipes blog.
This is the fourth post in the article series "Vim Plugins You Should Know About". This time I am going to introduce you to a plugin called "snipmate.vim". If you are intrigued by this topic, I suggest that you subscribe to my posts! For the introduction and first post in this article series, follow this link - Vim...