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What is crontab? Actually it is called 'cron daemon'. Cron is an automatic task machine. You will use it on your Unix or Linux operating systems for doing some tasks at specific intervals with out your intervention every time. You set the clock and forget. The cron daemon runs the work for you....
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What is a cookie? Sometimes it becomes necessary to track certain user details like (No. Of Visits, names, last visit, etc). The client machine stores such information and sends it to the web server whenever there is a request. Cookies data are sent along with the HTTP headers. You can look at...
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All of us have often encountered a "human" validation on various sites known as CAPTCHA, these are intended for bots - automatic programs - which crawl through websites and make comments, fill up contact forms etc. with the intention of marketing products, gaining backlinks, etc. The general...
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Introduction RSS is one the hottest technologies at the moment, and even big web publishers (such as the New York Times) are getting into RSS as well. However, there are still a lot of websites that do not have RSS feeds. If you still want to be able to check those websites in your favourite...
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Errors on the Internet, and those annoying error messages, occur quite frequently -- and can be quite frustrating, especially if you do not know the difference between a 404 error and a 502 error. Many times they have more to do with the Web servers you're trying to access rather than something...
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The latest version of HTML, viz. HTML5 brings in a lot of improvements & new feautres, and amongst those is the important one - form elements. HTML5 help you provide a rich user experience and layout with these new form elements. Although HTML5 is far from being useful to the mass and only the...
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URL Encoding also known as Percent-encoding is the way to encode data passed in an URI (Uniform Resource Identifier), this system is used to convert special characters to hex form prefixed with a % sign, and prevents broken URLs. An encoded URL will look like the following: ...
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Introduction The Wireless Markup Language (WML) is the HTML of WAP browsers and is transmitted via the HTTP protocol. WML is a markup language built specifically for communicating across WAP-based networks, and is based upon XML (eXtensible Markup Language). Like HDML, it is at first...
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If a webserver return "HTTP/1.x 404 Document Not Found" (or any other HTTP error), MSIE will display it's built in error message (which we all are quite acquainted to), not the custom error page if its smaller than 513 bytes. When you access Web pages from Internet Explorer 5.x and Internet...
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The Apache web server has a number of configuration options that are available to the server administrator. In a shared hosting environment, you don't have access to the main Apache configuration so you're stuck with the default configuration. However, it is possible to override some of the default...
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SSH is the descendant of rsh and rlogin, which are non-encrypted programs for remote shell logins. Rsh and rlogin, like telnet, have a long lineage but now are outdated and insecure. However, these programs evolved a surprising number of nifty features over two decades of UNIX development, and the...
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There are now several code obfuscation tools which will not really comprehensively "obscure" source code but somehow retrievably "crunch" it. This is not ideal but it is worthwhile nonetheless as it makes source sifting slow and painful for script kiddies/crackers. There are white space removers,...
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Introduction There's been a lot of publicity about pop-up windows, and most of it hasn't exactly been rave reviews. But it hasn't always been this way. In fact, pop-up windows were a positive component in the beginning. Created long before tabbed browsers, their purpose was to present...
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Apache is the number one Web server running on Linux systems. There are a number of little things that can be done to tune Apache performance and to lessen its impact on system resources. One of these things is tweaking the memory usage, which can be a difficult thing to profile. For instance,...
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In today's internet of JavaScript rich UI, it's sometimes very important to know the browser/platform user is using for browsing your site so that you can change the content dynamically according to the browser or the platform. Many sites are already working with this, like Firefox's official...
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Minifying JavaScript and CSS reduces their file sizes considerably, which is accomplished by removing comments, unwanted newlines, space & tab characters, in more advanced cases long variable names are renamed into smaller ones and all the occurrences of the variable name is updated in the script -...
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Sphinx (acronym for SQL Phrase Index) is a full-text search engine, it runs as a daemon and serves to requests of client applications. Client applications need to access Sphinx daemon via the native SphinxAPI, for which libraries are available in almost all popular languages like PHP, Perl, Ruby,...
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Web Storage also known as DOM storage is web application technology which allows storage of data inside a web browser. It is similar to storing data in cookies but the capacity is huge, but unlike cookies no stored data is sent over to the server with each request. Web storage can store both...
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We will use Amazon Linux AMI an the instructions are according to Amazon Linux AMI but I don't think they would vary too much for other Linux kernels. Step 1: Getting EC2 Instance Up and Running First Get Started With Amazon EC2 Instance and then Launch your Amazon EC2 Instance. Next is to...
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