hiiiiiiii ..please tell me how to install a software in linux,, is there any terminal command for it if yes .. then plz give me those commands for installing a software and also for removing the installed software

Would you be kind enough to post the following:

Distribution name and version:
Software name and version:

and look here : http://catb.org/~esr/faqs/smart-questions.html

If you use Ubuntu looking to sign on you're profile it is system>Administration>Synaptic Package Manager .
BTW nearly each distro do have a Package Manager to install or remove a software
BTW so have do to it as root or sudo or su

And please, again, use meaningful titles next time. "software" is almost as useless as a title as "problem" from your other post.

If you use Ubuntu, use either use Synaptic, or in a terminal:

sudo apt-get install package

Package manager cheat sheet for Ubuntu, OpenSUSE, Fedora/RHEL/CentOS, Mandriva, Slackware, Vector, Sabayon, Arch Linux, Foresight, and Pardus.

Most people install linux from what we call a Distro (distribution). Almost every disto has some way to keep software up to date and a way to install new software so that the entire disto keeps working. The disto's installed method is the preferred tool to start with.

If the distro doesn't offer a software you will have to find out a bit about the software before you attempt to install it.

Some apps can be installed by other manager methods, other repositories or simply following the read me file. Many are disto specific.

As above post the exact situation.

From the 11 threads started today, OP has just installed Ubuntu 9.10 and is having a lot of fun learning about it. He has not had a chance to reply to any of the threads yet.

For everything Ubuntu:
http://ubuntuguide.org/wiki/Ubuntu:Karmic