Mixture (Sanskrit - मिश्रण) of Interesting Topics

"Website Grabber is a utility that can be used to mirror, copy, synchronize, download, scrub or "steal" a web site." - from Epicware at  http://www.epicware.com/webgrabber.html ( Important Warning - Web Grabber should be built with a lot of caution as it might cause problem to server and if not controlled to the web, in scenarios like crawler crawling all the web, following all the links on the web, so that might be the reason to not having so many Web-Grabber Application on internet. Because people might use them for stealing the website designs or stylesheets or framework, etc.) My purpose of publishing this blog is to make people aware, to make them literate about how do they (Grabbers) work and how they can be built, but using them wisely is an individual responsibility. Last semester, we had a project to build a fully functional web-crawler just like Googlebot or  Yahoo! Slurp or msnbot or Bingbot, etc  (right, not that powerful). And I knew previous...

How to install / Configure Mantis For Apache-PHP-PostgreSQL combination  → I wanted to write this blog a long back, but better late than never. Three years back I was working on a project where we had used Mantis Bug Tracker for managing our bugs list, for that, I had to install it on a server from where our teams could access it to log the software bugs and update the fixes. Important learnings - with new php versions, I faced few issues with postgresql configs, then while setting up database instance for mantis I faced few issues with postgres port configs and how to give it on mantis config files, database user grant problem. I had to set up everything from scratch so learned a lot. (Note - mantisbt  →  mantis bug tracker) Why I have written this post  →  at that time I could not find any resource on web which would give me good tutorial on how to install mantisbt on Apache and PostgreSQL. So I wanted to put it on web so others could some of thei...

Few days back when I was doing some number multiplications, I found an easy way to square any number without much of calculations, so thought of sharing it. So here is my try to explain it and extend it for more number of digits and for more complex use also. (But for larger numbers, multiplications become painstaking and this might result in more time and merely just a stunt, this works good for max 5-6 digit number, though this trick can be used for higher digits also, but use it carefully.) Squaring is basically multiplying a number by itself e.g.  (89)² =  (89) *  (89) , (111)² = (111)*(111) , etc. And if you had a basic algebra classes then you should know this equation, where a & b are non-zero  → (a + b)²  =   (a + b)* (a + b)  =  (a)²  +  ( 2*a*b) + (b)² I use the same equation for this trick. e.g. we want to square a number, say 34, then as per (a+b) logic, its a = 30 and b = 4, but fo...