The Geek Stuff

3 Unix Shell Scripts – User Activity, View Processes, Display Memory

Sasikala — Fri, 30 Jul 2010 06:04:10 +0000

You might find the following three Linux / Unix shell scripts helpful. Display processes based on either %CPU or Memory Usage. Display which user is utilizing the CPU the most. Display system’s memory information – total, used and free. 1. List Processes based on %CPU and Memory Usage This script list the processes based on %CPU and Memory usage, with [...]

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Unix Shell Script to Execute Oracle SQL Query

Sasikala — Fri, 30 Jul 2010 06:02:52 +0000

Question: Can you provide me a shell script that will accept oracle credentials, sql query to be executed and displays the output? Answer: The shell script given below prompts some basic information and displays the output of the SQL. You can use the same concept and hard-code some of these values in the shell-script itself and even [...]

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Log Effectively Using Custom Perl Logger Module

Balakrishnan Mariyappan — Thu, 29 Jul 2010 06:02:47 +0000

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 module [...]

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Emacs Macro Tutorial: How to Record and Play

SathiyaMoorthy — Wed, 28 Jul 2010 06:02:51 +0000

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 and Play inside [...]

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Three Sysadmin Rules You Can’t (And Shouldn’t) Break

Ramesh Natarajan — Tue, 27 Jul 2010 06:02:36 +0000

When I drafted this article, I really came-up with 7 sysadmin habits. But, out of those 7 habits, three really stood out for me. While habits are good, sometimes rules might even be better, especially in the sysadmin world, when handling a production environment. Rule #1: Backup Everything ( and validate the backup regularly ) Experienced sysadmin [...]

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Bash String Manipulation Examples – Length, Substring, Find and Replace

Sasikala — Fri, 23 Jul 2010 06:04:11 +0000

In bash shell, when you use a dollar sign followed by a variable name, shell expands the variable with its value. This feature of shell is called parameter expansion. But parameter expansion has numerous other forms which allow you to expand a parameter and modify the value or substitute other values in the expansion process. In [...]

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How to Fix wget Connection Refused Error when I’m behind a Proxy

SathiyaMoorthy — Fri, 23 Jul 2010 06:02:17 +0000

Question: While downloading using wget, I get the following error “Connecting to <URL>.. failed: Connection refused.”. I’m behind a proxy server. How do I fix it? Answer: Export the http_proxy variable with your proxy server name or ip address and then try downloading as explained below. Connection refused error while using wget If http_proxy environment variable is not [...]

HowTo: 10 Steps to Configure tftpboot Server in UNIX / Linux (For installing Linux from Network using PXE)

Balakrishnan Mariyappan — Thu, 22 Jul 2010 06:02:15 +0000

In this article, let us discuss about how to setup tftpboot, including installation of necessary packages, and tftpboot configurations. TFTP boot service is primarily used to perform OS installation on a remote machine for which you don’t have the physical access. In order to perform the OS installation successfully, there should be a way to reboot [...]

5 Steps to Setup User and Group Disk Quota on UNIX / Linux

Ramesh Natarajan — Wed, 21 Jul 2010 06:02:13 +0000

On Linux, you can setup disk quota using one of the following methods: File system base disk quota allocation User or group based disk quota allocation On the user or group based quota, following are three important factors to consider: Hard limit – For example, if you specify 2GB as hard limit, user will not be able to create [...]

4 Ways of Executing a Shell Script in UNIX / Linux

SathiyaMoorthy — Tue, 20 Jul 2010 06:02:52 +0000

There are four ways to execute a shell script. Each way has it’s own meaning as explained in this article. 1. Execute Shell Script Using File Name Use the shell script file name to execute it either by using it’s relative path or absolute path as shown below. $ cd /home/sathiya $ ./scriptfile (or) $ /home/sathiya/scriptfile If you have the shebang, then [...]