Linux Chown Command Examples to Change Owner and Group

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The concept of owner and groups for files is fundamental to Linux. Every file is associated with an owner and a group. You can use chown and chgrp commands to change the owner or the group of a particular file or directory.

In this article, we will discuss the ‘chown’ command as it covers most part of the ‘chgrp’ command also.

1. Change the owner of a file

$ls -l filename
-rw-r--r-- 1 srinu chilukuri 0 2013-10-16 20:03 filename

$ chown root filename

$ls -l filename
-rw-r--r-- 1 root chilukuri 0 2013-10-16 20:05 filename

So we see that the owner of the file was changed from ‘srinu’ to ‘root’.

Character counter in JavaScript

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This is about creating a character counter for textarea and limit it accordingly. You may have seen this kinda stuff in some messaging site mostly in sites which provides SMS facilities. They limit us to enter only specified number of characters in text area. Also in some sites there are limitation on characters in comments.Twitter also having character limit in tweet.

Iam explained in this article, how to use the count character javascript with the help of a form. The count value decreases when you type each character into textbox.

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Php script for downloading files

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In this article am going to explain you how to create PHP file downloader to download any files from web server to local machine. This application works mainly on the header of the PHP.
When you want to download any file you need to send the file name to this application, rest of the thing PHP will handle.

file_get_contents vs cURL

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In this Post,I will explain difference between file_get_contents and curl.

PHP offers two main options to get a remote file, curl and file_get_contents. There are many difference between the two. Curl is a much faster alternative to file_get_contents.

Using file_get_contents to retrieve http://www.knowledgecornor.com/ took 0.198035001234 seconds. Meanwhile, using curl to retrieve the same file took 0.025691986084 seconds. As you can see, curl is much faster.

file_get_contents - It is a function to get the contents of a file(simply view source items i.e out put html file contents).

Tweet Images using PHP (Twitter API)

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Hi already I'm Expalin about how to create Twitter App ,Today i have worked on Twitter Oauth in this post expalin about how to tweet with images using php with Twitter API.

First we have to Create Twitter App The Twitter App Creation Process Find Here

Creation of Twitter App

How the Tweet Images Code Works?
The code for tweet images divided in two files, the first is “start.php” where the code start and a second file “callback.php” where twitter will redirect user back after giving authorization to our app. (the URL to our callback.php file has been updated in App settings at the time of app creation )

Simple Drop Down Menu with Jquery and CSS

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This post is very basic level Jquery and CSS implementation. I want to explain how to design simple drop down menu with CSS, HTML and Jquery.
This system helps you to minimise the menus list.

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Zooming Images using jQuery

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Image zoom-in is very useful feature in an eCommerce website to show your product images to viewers in zoom with there ease. So in this tutorial i am going to show you how to make a very simple zoom in image program in which I have used a jQuery plugin

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