General

Are you always sending SMS to your friend’s cellphone from your cellphone? Did you know that you can SMS to someone using email? This list is extremely helpful, if you are outside US and would like to SMS someone in US, you can just send it as an email. This also helps sysadmins, who want [...]

If you are a system administrator, or IT manager, or someone who is responsible for IT infrastructure, you should implement an enterprise level monitoring solution. The shell script you’ve written that does a ps -ef and sends you an email might do the basic job, but it doesn’t count as monitoring. If you want to [...]

IPC stands for Inter-process Communication. This technique allows the processes to communicate with each another. Since each process has its own address space and unique user space, how does the process communicate each other? The answer is Kernel, the heart of the Linux operating system that has access to the whole memory. So we can [...]

RAID stands for Redundant Array of Inexpensive (Independent) Disks. On most situations you will be using one of the following four levels of RAIDs. RAID 0 RAID 1 RAID 5 RAID 10 (also known as RAID 1+0) This article explains the main difference between these raid levels along with an easy to understand diagram. In [...]

Snort is a free lightweight network intrusion detection system for both UNIX and Windows. In this article, let us review how to install snort from source, write rules, and perform basic testing. 1. Download and Extract Snort Download the latest snort free version from snort website. Extract the snort source code to the /usr/src directory [...]

For any custom written user services and processes, you should maintain a log file to view the status of the service, or to troubleshoot any issues with the services/processes. Perl CPAN offers few modules which provides the automated object interface for handling logging for services. In this article, let us write our own Perl logger [...]

Using Emacs Macro feature you can record and play a sequence of actions inside the editor. This article explains how to perform record and play inside Emacs editor with an example. If you are a Vim editor fan, refer to our How to record and play inside Vim editor article. High Level Steps to Record [...]