Author: ACMer

Thousands of websites are using CloudFlare, the famous Content Delivery Network (CDN). The advantages of using CloudFlare are: 1. increase page loading speed so that content of website can …

In Linux BASH shell, you can use curly brace {} to represent a set of possible values in an array. For example, touch abc{1,2,3,4} This will be equivalent to …

Sometimes, you want to know if your crontab is working or not, you would need to test your crontab to see if crontab jobs will be actually executed and …

Google Talk Chat supports a thumb-up symbol by typing (y). However, the thumb image is the opposite of the one defined in Facebook. FB introduces this symbol first and …

If you want to solve the following puzzle then it may be not so easy/intuitive at a glance. It is a square and 20 is the area with e.g. …