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1. First, see the the "Getting Started in UT ATLAS" page. You'll need an account on the UT ATLAS cluster. 
2. Once you have your account, open a terminal window (linux), the Terminal application (OSX), or download and install an Xterm application for Windows (for example, MobaXterm is a good one, and free).
3. On the command line ssh into one of the taumachines, for example ssh -X -Y YOUR_USER_NAME@top1.hep.utexas.edu
   
4. You should now have a command prompt on the machine. To make sure you can open an X-Window try xclock. You should see a little clock open in a window. You can kill the clock with Ctrl-C, or use Ctrl-Z and then bg if you'd like to keep it running in the background. (Here's a useful and brief overview of linux commands.) 
5. Now take a look at what is in your .bashrc file. This is a list of commands that run whenever you log in. You can edit it with emacs .bashrc & . (More about emacs can be found in this emacs tour.)
6. You should make sure (add) the following lines to this file:
   <code> 

   
   

   Code Block
   language bash
   export ATLAS_LOCAL_ROOT_BASE=/cvmfs/

   atlas.cern.ch/repo/ATLASLocalRootBase/

   export ALRB_localConfigDir=/code/localConfig

   . /cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase/user/atlasLocalSetup.sh

   
   </code>

7. Save the file in emacs with Ctrl-X Ctrl-S, and then quit with Ctrl-X Ctrl-C.

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