Shell script to delete redis keys matching a pattern

A quick way to delete redis keys from the command line would be:         redis-cli DEL "del_key" If you wish to delete all keys matching a certain pattern,         redis-cli KEYS "*del_pattern*" | xargs redis-cli DEL A more easy shell script for it would be: ...

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Modal dialog box and popups in Angular.js using ngDialog

If you are building an Angular.js application and wish to add a modal dialog box or a simple popup, then the ngDialog module provides an easy, simple solution. It provides two default css themes and we can also add our own custom themes. Let's see how to create a simple dialog box with ngDialog. For our example, we will have a base page with a button which when clicked will open a contact-us form...

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Lookahead in regular expressions

As I was solving a couple of problems in Checkio, I came across a new concept - lookaheads in regular expressions. At first, it was slightly confusing to understand how lookaheads are different from normal regular expressions. But they actually prove to be very useful in certain cases. Lookaheads are zero-length assertions as they do not consume characters in the string but only assert whether...

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Configure Nginx for load balancing

Recently, in our project, I was asked to configure Nginx for load balancing as our app was becoming slow, owing to high traffic. I haven't worked much with Nginx, so I was a bit apprehensive at first. As it was Diwali holidays, nobody else was there in office and I had no choice. However, on fumbling around, it turned out to be much more easier than I had thought. Imagine that you wish to run...

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At Wayanad - In the lap of nature

"Actually, the best gift you could have given her was a lifetime of adventures..." - Lewis Carroll in 'Alice in Wonderland' Last week, owing to Muharam and Guru Nanak Jayanthi, we again had a couple of holidays and as I was heading out on another trip, my friends at office were kidding me on how...

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Night Trek and Cave Exploring At Antaragange

"We live in a wonderful world that is full of beauty, charm and adventure. There is no end to the adventures we can have, if only we seek them with our eyes wide open."  - Jawaharlal Nehru Last weekend was one of those rare long weekends with five days of festival holidays. I had been planning...

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Calculating the number of working days using Python

At times, we have a requirement to calculate the number of weekdays / working days between two dates. Here's how you do it using Python: This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. ...

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