February 2011

It’s a Cute Baby Girl!

by Ramesh Natarajan on February 22, 2011

I would like to share this wonderful event in my life with all TGS readers.

We are blessed with a beautiful baby girl. Both mom and baby are doing well.

Holding this cute tiny package in my hands puts my life in perspective, and instantly gives me more meaning and purpose to my life. Words cannot express my happiness.

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Linux IPTables: How to Add Firewall Rules (With Allow SSH Example)

by Ramesh Natarajan on February 14, 2011

This article explains how to add iptables firewall rules using the “iptables -A” (append) command.

“-A” is for append. If it makes it easier for you to remember “-A” as add-rule (instead of append-rule), it is OK. But, keep in mind that “-A” adds the rule at the end of the chain.

Again, it is very important to remember that -A adds the rule at the end.
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UNIX / Linux: 3 Ways to Send Signal to Processes

by Balakrishnan Mariyappan on February 8, 2011

Question: How do I send signal to another process? Can you explain me all available options to send signals to a process in UNIX / Linux environment?

Answer: You can send various signals to processes using one of the methods explains in this article.
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6 Stages of Linux Boot Process (Startup Sequence)

by Ramesh Natarajan on February 7, 2011

Press the power button on your system, and after few moments you see the Linux login prompt.

Have you ever wondered what happens behind the scenes from the time you press the power button until the Linux login prompt appears?

The following are the 6 high level stages of a typical Linux boot process.
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UNIX / Linux: How to Use Sticky Bit on Directory and File

by Balakrishnan Mariyappan on February 1, 2011

You would set the sticky bit primarily on directories in UNIX / Linux.

If you set the sticky bit to a directory, other users cannot delete or rename the files (or subdirectories) within that directory.

When the sticky bit is set on a directory, only the owner and the root user can delete / rename the files or directories within that directory.
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