Amazon Elastic Compute Cloud – EC2
Elastic Compute Cloud (EC2) refers to compute (server) resources. In AWS, servers are called Amazon EC2 instances or just “instances”.…
What is the difference between include, include_once, require, and require_once in PHP
PHP provides four functions which enable you to insert code from other files. * include()* require()* include_once()* require_once() All four…
Java Linked List
The Internet is full of code examples on how you can create your own LinkedList class. Java provides and very…
MySQL column enumeration example
Problem: You are building a database and you have a field that can accept only certain responses. For example, there…
How to encrypt a string in PHP
The following code encrypts a string. crypt() function encrypts the string. The last line prints the encrypted string. There is…
Perl $_ vs. $_[]
For a beginner, Perl can be a frightening language. This is largely due the numerous special variables used in perl.…
Installing and Using SSH on Unix/Linux
SSH client can be downloaded from www.openssh.com. To install, do the following: To use, type the following:
for loop in bash
For loops in bash a similar to commonly used languages such as Perl and C. bash loops do not use…
Linux: Copy all files with exception
Sometime we need to copy entire directory with the except of a few files or a specific directory. This could…
PHP Unit Testing with SimpleTest
What is Unit Testing Most developers agree that testing is important but few test their code. Even fever do it…