The Geek Stuff

Best Coding Practices for Linux System Programming in C Language – Part 1

Himanshu Arora — Fri, 25 May 2012 06:02:44 +0000

While developing a program, the programmer has to keep several things in mind like the code should not be complex ie it should be maintainable, portability is another area that is to be kept in mind. So we see that there are some good practices that the programmer should follow in order to produce a [...]

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How to Setup Rsync for Windows Using DeltaCopy

Ramesh Natarajan — Wed, 23 May 2012 06:02:58 +0000

You already know how powerful rsync utility is on Linux platform. One of the useful feature of rsync is that it can incrementally copy big files. i.e If you have a huge file (especially backups), that keeps changing every day, but you don’t need to copy the whole file. Instead using rsync, you can copy [...]

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7 Linux df Command Examples

Himanshu Arora — Mon, 21 May 2012 06:02:51 +0000

df command in Linux provides disk space usage information of your file systems. Even if you already know about this command, probably one of the examples mentioned below might be new to you. A sample output from df command is as follows: $ df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 132239776 6210884 119311504 [...]

UNIX / Linux Processes: C fork() Function

Himanshu Arora — Fri, 18 May 2012 06:02:18 +0000

Every running instance of a program is known as a process. The concept of processes is fundamental to the UNIX / Linux operating systems. A process has its own identity in form of a PID or a process ID. This PID for each process is unique across the whole operating system. Also, each process has its [...]

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How to Calculate IP Header Checksum (With an Example)

Himanshu Arora — Thu, 17 May 2012 06:02:21 +0000

If you have ever tried to understand the TCP/IP protocols then you would have definitely stumbled upon the checksum field that is the part of protocol headers like TCP, IP etc. Have you ever given a thought about things like what exactly is checksum, why is it used and how it is calculated. Well, in [...]

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How to Encrypt Your Bash Shell Script on Linux Using SHC

Ramesh Natarajan — Tue, 15 May 2012 06:02:44 +0000

Q: How do I encrypt my bash shell script on Linux environment? The shell script contains password, and I don’t want others who have execute access to view the shell script and get the password. Is there a way to encrypt my shell script? A: First, as a best practice you should not be encrypting [...]

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Intro to DOCSIS Architecture, CM CMTS Protocol for Cable Modems

Himanshu Arora — Fri, 11 May 2012 06:02:42 +0000

Fast data communication has become the basic need of todays world and Internet has become the heart of the communication ecosystem. Devices like mobile phones (whose purpose is voice communication) are having Internet connectivity and PCs, laptops etc (which are mostly used for web surfing) are now also being used for voice communication. So we [...]

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Ettercap Tutorial: DNS Spoofing & ARP Poisoning Examples

Lakshmanan Ganapathy — Thu, 10 May 2012 06:02:37 +0000

Ettercap stands for Ethernet Capture. Ettercap is a comprehensive suite for man in the middle attacks. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols and includes many features for network and host analysis. Download and Install Download the [...]

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Linux Traceroute Command Examples

Himanshu Arora — Wed, 09 May 2012 06:02:20 +0000

There are scenarios in which one would like to know the route which a connection follows. By route here we mean the IP addresses of all the forwarding entities (like routers in between). Although there is no guarantee that the route will remain same for all the packets of a connection but usually it is [...]

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How to Install Apache 2.4.2 from Source on CentOS 6.2 with SSL

Ramesh Natarajan — Mon, 07 May 2012 06:02:16 +0000

If you try to follow the how to install Apache with SSL article that we discussed a while back, you’ll face an issue during “make” because of version compatibility between Apache 2.4.4 and APR utilities (Apache Portable Runtime Library) that comes with CentOS 6. We’ve explained in this article how to solve that issue to [...]

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