Uno de los peores hábitos, en cuanto a seguridad en informática se refiere, es utilizar la cuenta de administrador de forma compulsiva para todo, sin importar que la tarea que estemos haciendo requiera privilegios de administrador o no. Esto se puede aplicar tanto a la cuenta de root en un sistema GNU/Linux como al usuario administrador en WordPress. Lo ideal sería utilizar una cuenta con el mínimo nivel de privilegios posible que nos permita llevar a cabo nuestra tarea. ...

While transistors have many uses, one of the less known uses by amateurs is the ability for bipolar transistors to turn things on and off. While there are limitations as to what we can switch on and off, transistor switches offer lower cost and substantial reliability over conventional mechanical relays. In this article, we will review the basic principles for transistor switches using common bipolar transistors. The most commonly used transistor switch is the PNP variety shown in Figure 1. The secret to making a transistor switch work properly is to get the transistor in a saturation state. For this to happen we need to know the maximum load current for the device to be turned on and the minimum HFE of the transistor. ...

La Escuela Superior de Informática de la Universidad de Castilla-La Mancha ha liberado el material de la primera edición del Curso de Experto en Desarrollo de Videojuegos. El material, compuesto por 4 libros de más de 1.200 páginas en total y múltiples ejemplos de código fuente, se basa principalmente en tecnologías y estándares libres. Casi la totalidad de los ejemplos del curso han sido desarrollados en GNU/Linux. Puedes descargar los libros gratuitamente en la web del curso (formato PDF), en EPUB o comprar los libros en papel. Los ejemplos del libro se distribuye con licencia GPLv3 y el libro con licencia Creative Commons BY NC ND ...

A basic tenets of UNIX philosophy is to create programs (or processes) that do one thing, and do that one thing well. It is a philosophy demanding careful thought about interfaces and ways of joining these smaller (hopefully more simple) processes together to create useful results. Normally textual data flows between these interfaces. Over time, more and more advanced text processing tools and languages have been developed. For languages, earlier on there was perl, later came python, and ruby. While these and other languages are very capable text processors, such tools are not always available, especially in a production environment. In this article, a number of basic UNIX text processing commands are demonstrated and may be used individually or in conjunction with each other to solve problems which may also be addressed with newer languages. For many people, an example provides more information than long winded explanations. Please note because of the variety of UNIX and UNIX-like systems available, command flags, program behavior, and output differs between implementations. ...

You want to teach yourself vim (the best text editor known to human kind) in the fastest way possible. This my way of doing it. You start by learning the minimal to survive, then you integrate all the tricks slowly. Vim the Six Billion Dollar editor Better, Stronger, Faster. Learn vim and it will be your last text editor. There isn’t any better text editor that I know of. It is hard to learn, but incredible to use. ...

N-Tier architecture is an industry-proved software architecture model, suitable to support enterprise-level client/server applications by resolving issues like scalability, security, fault tolerance and etc. .NET has many tools and features, but .NET doesn’t have pre-defined ways to guard how to implement N-Tier architecture. Therefore, in order to achieve good design and implementation of N-Tier architecture in .NET, understanding fully its concepts is very important. However, many of us may hear, read or use N-Tier architecture for many years but still misunderstand its concepts more or less. This article tries to clarify many basic concepts in N-Tier architecture from all aspects, and also provide some practical tips. The tips in this article are based on the assumption that a team has a full control over all layers of the N-Tier architecture. ...

In the same vein, programmers who pay attention to how they construct written language also tend to pay a lot more attention to how they code. You see, at its core, code is prose. Great programmers are more than just code monkeys; according to Stanford programming legend Donald Knuth they are ”essayists who work with traditional aesthetic and literary forms.” The point: programming should be easily understood by real human beings ” not just computers. ...

En un lugar de Melee Island^TM^ de cuyo nombre no quiero acordarme, nuestro wannabe pirata se llamaba Guybrush Threepwood. Tenía unos veinte años, y pesaba poco más de 54 kilos. Aguantaba la respiración durante 10 minutos, intentaba vender unas bonitas chaquetas de piel y soñaba con ser pirata. Todo eran peleas de espadas e insultos, grog y pollos de goma con poleas en medio, hasta que cayó enamorado de la gobernadora Marley que, tras ser secuestrada, le condujo hasta el malvado y temible pirata fantasma LeChuck. ...

Ninguna multinacional tiene tantas sucursales, ninguna empresa engloba tanto personal a su cargo y ningún holding ha podido sacar al mercado un producto más rentable. Jamás ha existido un negocio tan beneficioso y duradero a pesar de haber demostrado con el paso del tiempo estar tan radicalmente equivocado en sus afirmaciones. Es el sueño dorado de cualquier empresario: crecer sin límite sin que ninguno de tus errores detenga tu prosperidad. ...

You can tell a lot about a shell user by looking at their prompt. Most shell users will use whatever the system’s default prompt is for their entire career. Under many Linux distributions, this prompt includes the username, the hostname, and the current working directory, along with a $ sigil for regular users, and a # for root. » Tom Ryder | blog.sanctum.geek.nz