February 2016

Docker can be used to run nginx in a container. We’ll use Ubuntu Linux (14.04.2) for the purpose of this tutorial. This tutorial assumes that read more

This Chrome extension tutorial will cover building a basic hello world chrome extension where clicking on extension icon will open a popup window containing active read more

CSS pseudo element ::before and ::after (CSS 2 syntax :before and :after) can be used to place some content before or after an element. Most read more

Docker inspect can be used to get information including IP address about a container using its id or name. $ docker inspect [container_name_or_id] To get read more

Some handy command to work with containers. We’ll assume a docker image ubuntu is available on current machine. Run interactive shell (or any other command) read more

To remove a user from a group on Linux, one can use gpasswd or deluser. Here are sample commands. Using gpasswd To remove user1 from read more

It is a good idea to add a user to docker group. In case user is not added to docker group, you may see the read more

Docker is an open-source project that automates the deployment of applications inside software containers. Here is Docker quick start guide on Ubuntu Linux. We’ll use read more

An error in robots.txt can cause Google to stop crawling a section of your site. In such case it is good to update and resubmit read more

Linux (or Unix) command line utilities like awk, sort, uniq, can be used to analyze apache log to get interesting stats. One use case is read more

In case you get lot of emails, its useful to create gmail filters to apply labels automatically and optionally archive matching emails. Gmail search can read more

Chrome extension is very powerful feature of Chrome browser and an extension can be very useful for performing various activities on a web page. This read more

If you want to access pre-release features of Google Chrome, you can download Chrome Canary which is usually few versions ahead of stable Google Chrome. read more

Chrome has many useful internal page urls which begin with chrome://. One such example is chrome://settings. These are some handy internal command urls which can read more

Chrome developer tools can be used to view browser HTTP request and response headers when browser loads a page or makes AJAX calls. Here are read more

PHP function static variable exists only in a local function scope but it does not lose its value after function execution. It can be used read more

If you are building Chrome extensions and want to load extensions from directories, you need to enable Chrome developer mode for extensions. Here are quick read more

When writing bash scripts or running something on command line, last command exit code status is stored in environment variable $?. It can also be read more

On Linux or Unix, error from a command (stderr) can be redirected to stdout or a file. These are the file descriptor id used on read more

PHP has inbuilt function rtrim to remove specific or all trailing whitespaces from end of php string. preg_replace can also be used for this purpose. read more

PHP exec and shell_exec can be used to execute a shell command on server side. exec also populates shell exit return status in one of read more

Linux (or Unix) grep without any options does a regex grep on input stream. To disable regex either one can use grep -F or fgrep. read more

Python map is very useful built-in python function to achieve complex stuff over a list in very short and elegant way. Note that map applies read more

Angularjs basic controller clock example to display date and update it every second. We’ll use controller, template and $timeout. We used AngularJS $timeout here. If read more

Angularjs basic controller example to initialize a number in view, and then increment it on button click. We’ll use controller, template and ng-click directive. The read more

PHP regex whitespace shorthand \s can be used to match whitespace characters. These are the characters it will match. Char Dec val Oct val tab read more

HTML5 shadow dom is part of Web components. It is currently in draft stage and supported by Chrome. It can also be compared with react read more