Steam for Linux

http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=84

The Steam Client is strictly a Windows application, and there are no current plans to create a native Linux Steam Client at this time.

Although the Steam Client is not available for Linux, there is a native Linux version of the Half-Life Dedicated Server available.

The best source of information on this product is the Steampowered.com Linux Server Forum: Linux Dedicated Server

There is also an ADMIN Mail list for Linux that you can read the archives and join to ask questions: hlds_linux -- Half-Life dedicated Linux server mailing list

If you wish to run the Dedicated Server under Linux, you can download the Server Installation tool:

hldsupdatetool.bin

http://storefront.steampowered.com/download/hldsupdatetool.bin

Quick Setup Guide

For a new install, go to your homedir and make a new dir for the server, and then go into that dir. If you already have an installation that you want to update, just use the existing hlds_l dir.

1. Make a new directory: mkdir hlds_l

2. Change to that directory: cd hlds_l

3. Copy the binary the hlds_l directory and then use the "steam" executable to update.

4. Here is how to convert the bin to the steam executable:

chmod +x hldsupdatetool.bin

./hldsupdatetool.bin

5. Now make it executable.

chmod +x steam

6. You will need to run the steam executable with no arguments first so it will self-update to the latest version.