The Geek Stuff

Linux Directory Structure (File System Structure) Explained with Examples

Ramesh Natarajan — Wed, 08 Sep 2010 06:02:58 +0000

Have you wondered why certain programs are located under /bin, or /sbin, or /usr/bin, or /usr/sbin? For example, less command is located under /usr/bin directory. Why not /bin, or /sbin, or /usr/sbin? What is the different between all these directories? In this article, let us review the Linux filesystem structures and understand the meaning of [...]

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How To Use Squid Proxy Cache Server To Control Internet Access

Balakrishnan Mariyappan — Wed, 01 Sep 2010 06:02:00 +0000

Squid is a proxy caching server. If you are Linux sysadmin, you can use squid to control internet access at your work environment. This beginners guide will give a jump-start on how to setup squid on Linux to restrict internet access in an network. Install Squid You should install the following three squid related packages [...]

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Top 10 Open Source Bug Tracking System

Ramesh Natarajan — Tue, 31 Aug 2010 06:02:56 +0000

All IT projects needs a bug tracking (or issue tracking, or defect tracking) system. Sure, we need a bug tracking system for a software development project. But, what about a sysadmin team, dba team, network team? They all need some help to track their work, and issues of their system, database and network. I’ve listed [...]

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Linux cpio Examples: How to Create and Extract cpio Archives (and tar archives)

Balakrishnan Mariyappan — Thu, 26 Aug 2010 06:02:49 +0000

cpio command is used to process archive files (for example, *.cpio or *.tar files). cpio stands for “copy in, copy out”. cpio performs the following three operations. Copying files to an archive Extracting files from an archive Passing files to another directory tree cpio takes the list of files from the standard input while creating [...]

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Packet Analyzer: 15 TCPDUMP Command Examples

Sasikala — Wed, 25 Aug 2010 06:02:50 +0000

tcpdump command is also called as packet analyzer. tcpdump command will work on most flavors of unix operating system. tcpdump allows us to save the packets that are captured, so that we can use it for future analysis. The saved file can be viewed by the same tcpdump command. We can also use open source [...]

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How To Be Productive and Get Things Done Using GTD

Ramesh Natarajan — Tue, 24 Aug 2010 06:02:17 +0000

Do you need more time to do the things that you enjoy? Of course, you do. For geeks there are tons of technical projects to mess with, but we don’t have enough time. Over the years, I’ve tried few time management and productivity systems. While they all helped me grow, there is something in those [...]

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How to Send SMS Using Email to Major US Cellphone Carriers

Ramesh Natarajan — Fri, 20 Aug 2010 06:04:29 +0000

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 [...]

HBA WWN: How to Find Qlogic or Emulex HBA Card WWN Address on Linux

Ramesh Natarajan — Fri, 20 Aug 2010 06:02:57 +0000

Question: How do I lookup the wwn address of my HBA card installed on the Linux system. I need this information to create zoning on my fiber channel switch. Answer: Use one of the following methods to view the HBA WWN address on Linux. Method 1: /sys/class/scsi_host/host{n}/device/fc_host:host{n}/port_name File On Redhat 5 and above (including OEL [...]

Can You Make It? Compile C Programs on Linux Using Make Command

Balakrishnan Mariyappan — Thu, 19 Aug 2010 06:02:04 +0000

When you install any software from source, you typically execute commands like — “make”, “make install”, “make clean”, etc. Have you wondered what all these make commands are really making? Sure, we know that it is trying to compile and install the software. But, why make? What does it really do? For compiling a single [...]

UNIX / Linux: 2 Ways to Add Swap Space Using dd, mkswap and swapon

Ramesh Natarajan — Wed, 18 Aug 2010 06:02:48 +0000

Question: I would like to add more swap space to my Linux system. Can you explain with clear examples on how to increase the swap space? Answer: You can either use a dedicated hard drive partition to add new swap space, or create a swap file on an existing filesystem and use it as swap [...]