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Sipcalc is an advanced console-based IP subnet calculator. It can take multiple forms of input (IPv4/IPv6/interface/hostname) and output a multitude of information about a given subnet. On ubuntu, you can install it from software center or from the command line

The time command is an excellent tool for analyzing the performance of a shell script or command. Simply type time followed by the command that you wish to time. Three results are printed when the program or script finishes executing: the actual length of time (real-world time spent on the program), the total time spent in the program, and the total time spent on CPU overhead. The first figure is perhaps the most useful, but the third figure will tell you how busy your CPU is.

There are several commands available on the command line to locate files and folders on the file system. This article reviews three of them, viz whereis ,locate. find.

Watch your BIOS settings with dmdeicode and biosdecode. The Desktop Management Interface (DMI) generates a standard framework for managing and tracking components in a desktop, notebook or server components , by abstracting these components from the software that manages them. Modern mother boards are compatible with this standard. For a lay user it means that the BIOS settings can be watched from your OS. DMI standards are published by Distributed Management Task Force (DMTF) into desktop-management standards. They also provide a related standard named SMBIOS (System Management BIOS).

Clamav is the most popular free anti virus program for Linux environment.( Of course it scans for widows virus) However, clam is a command line utility and you need some skills for manipulating is properly. There are several graphical front ends for clam av which can make your life easy. The most popular among them are clamtk and Klamav.

Nautilus image converter is a nautilus extension to mass resize or rotate images. if installed an additional menu entry will appear when you right click the mouse inside nautilus. It is a convenient utility which can save you lot of effort.

An overburdened CPU is another obvious place to look for performance problems on your system. Similarly io can be a bottleneck in proper system performance. You can watch various parameters if you install sysstat package. On Ubuntu you can install with $ sudo apt-get install sysstat

For any one running a linux desktop/server , the amount of free memory available on the system is one of the critical parameters that deterimine the system response. We will look at some commands which give you information about memory usage

Bleach bit is a utility which can free disk space, removes hidden junk, and easily guards your privacy. It can erase cache, delete cookies, clear Internet history, remove unused localizations, shred logs, and delete temporary files. It supports around 70 applications and can be installed on windows and linux. On ubuntu bleachbit is available on the repository. However, it is a nice idea to look at the bleachbit website for any new versions.

Portable document format is one of the most popular file formats on the web. Of course Adobe is the market leader for PDF. However, there are lot of free alternatives around. Here are some free pdf viewers for ubuntu.

Byobu is a Japanese term for decorative screens .You can achieve decorative effects on your gnome terminal or xterm , or Konsole with Byobu software available from ubuntu launchpad. In fact, the new ubuntu 9.10 ships it by default

How to install android sdk 1.6 on Ubuntu 9.04 Google has recently released version android SDK 1.6. This tutorial will teach you how to install it on ubuntu 9.04.

Shutter, according to its website is a feature full screen shot program. As a tech blogger experimenting with GNU/Linux and its derivatives, it offers me a number of handy features. In fact, I have replaced it as my default screen shot tool. When I press Print Screen on my keyboard,shutter pops up and does a nice job.

I use gnome as my default desktop at home and at office. However, my machines have alternate desktop enlivenment such as kde or xfce installed. I use it to test out features of these environment. The normal way to switch to a different desktop is to log out from the current desktop , select a new session form the gdm login window and login again. However, it is possible to open a new desktop environment in a virtual console using xnest nested xserver.

At home, I have,2 machines; one running Ubuntu 9.04 (Jaunty) and the other running Ubuntu 8.04 (Hardy). The Hardy machine is used by my family members and I use Jaunty for my experiments. Some times, I would like to test some thing on Hardy also. But most of the times that machine is not free. I use ssh to login to the hardy box and use an ssh tunnel to export the GUI session back to my Jaunty box.

The DNS servers of my ISP is always behaving erratically. The DNS look up times are abysmally large and some times I get an address not found error while browsing. On ubuntu/debian systems the DNS servers are specified in /etc/resolv.conf. I tried to edit /etc/resolv.conf and put open dns servers as default DNS servers. But, my ISP supplies their DNS server address along with IP address for the system via DHCP. Every time my system renews its DHCP lease. my /etc/resolv.conf is also rewritten with their DNS address.

LTSP was available as an install option in Ubuntu 8.04 and 8.10 from the alternate install CD . However I am unable to find it on the Jaunty CD. So, here is a quick how to on installing LTSP on ubuntu 9.04.