October 2011

20 OpenOffice Calc Spreadsheet Tips and Tricks

by Ramesh Natarajan on October 31, 2011

OpenOffice works on both Linux and Windows. On Ubuntu, OpenOffice is the default office suite. On Windows, instead of spending money on Microsoft Office, download and use Openoffice.

OpenOffice Calc offers pretty much most of the functionalities that are in Microsoft Excel. The following is the list of some Openoffice calc spreadsheet tips and tricks.
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How to Create and Delete VLAN on Cisco Catalyst Switch

by Ramesh Natarajan on October 28, 2011

One of the typical configuration activities you’ll perform on a Cisco Switch is to manipulate VLANs.

VLAN stands for Virtual Local Area Network.

In one physical cisco switch, you can create multiple VLANs that connects to different network.

For example, a VLAN for 10.10.191.0 network, a VLAN for 10.10.192.0 network, and a VLAN for 10.10.193.0 network. All three of these can be configured in the same physical switch.
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RAID 10 is not the same as RAID 01.

This article explains the difference between the two with a simple diagram.

I’m going to keep this explanation very simple for you to understand the basic concepts well. In the following diagrams A, B, C, D, E and F represents blocks.
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7 Linux Grep OR, Grep AND, Grep NOT Operator Examples

by Ramesh Natarajan on October 21, 2011

Question: Can you explain how to use OR, AND and NOT operators in Unix grep command with some examples?

Answer: In grep, we have options equivalent to OR and NOT operators. There is no grep AND opearator. But, you can simulate AND using patterns. The examples mentioned below will help you to understand how to use OR, AND and NOT in Linux grep command.
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Question: I changed the password of my Ubuntu account from System -> Preferences -> About me.

After this change password, anytime I login using the new password, my wireless doesn’t connect automatically. Instead, it prompts me a dialogue “Enter password to unlock your login keyring”, and I have to enter my old login password to get the wireless connection working. How do I fix this problem?
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sbackup stands for simple backup.

sbackup is a backup utility for GNOME desktop. The user interface is simple, intuitive and has several advanced features to satisfy most of your typical Linux desktop backup needs.

If you need a very simple and straight forward backup GUI tool for Ubuntu, check out pybackpack that we discussed earlier.
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Explore GCC Linking Process Using LDD, Readelf, and Objdump

by Himanshu Arora on October 17, 2011

Linking is the final stage of the gcc compilation process.

In the linking process, object files are linked together and all the references to external symbols are resolved, final addresses are assigned to function calls, etc.

In this article we will mainly focus on the following aspects of gcc linking process:

  1. Object files and how are they linked together
  2. Code relocations

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Dennis Ritchie – Father of C Programming Language

by Ramesh Natarajan on October 14, 2011

Dennis Ritchie 1941 – 2011.

May his soul rest in peace.

Just like many of you, I fell in love with computers only after I stated learning C programming language, which is a gold standard for several other programming languages that came after that. I used to code very intensively in C programming language when I started my career in the IT industry.
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