Tutorials Step 0: Computer Setup

Welcome to the SK tutorials!

Before we start using SK software and code, it is important that we make sure you have a computer to work on that can use the tutorial software.  The ideal place to do the tutorials is on-site, such as on the Duke neutrino computers.  If that is difficult or not possible, these tutorials can also be done on the Kamioka computers, or remotely, via ssh or vpn.

Either way, you’ll need to get an account.  Talk with your professor, they can help set you up!  If you’re working on site, you can just log in to the computer, and go.  If you’re working off-site, you’ll need some software to help you connect remotely.  Information on that is located on <some separate page to be made>.  Don’t forget to change your password away from the default one as soon as possible!

Say hello to the terminal!

Though you should probably just use the keyboard (how quaint).  Using the terminal to manipulate files and run software may seem antiquated, but it is actually quite easy to do, and quite powerful, once you get used to it.  If you are new to this, you might want to read up on some of the basic commands, such as:

  • ls dirname to list the contents of a directory
  • cd dirname to go to a directory ( cd .. to go up one level )
  • cp file1 file2 to copy one file to another

You can find tips and other help from a variety of places online.  Some suggestions include this tutorial, this wikibook, the Duke Physics computing documentation, and, of course, google.  Before you know it, you’ll wonder how you lived before tab completion and middle-click paste.

The most common thing you will be doing is editing text files (the code!)  You will need to use a text editor.  A popular one for beginners is gedit.  Those looking for a more powerful text editor may find emacs or vim to be more to their liking.  Whichever one you choose, you can open a file to read (or write, if you’re allowed) with the editor name, followed by the file name.  For example

gedit examplefile.C

to open the file examplefile.C in gedit.  If examplefile.C didn’t exist when you started, this would create a new file with that name.

Setting the shell

The shell is the software which takes the commands you type in to the terminal and turns them into actions.  Most unix/linux shells are fairly similar, but, for simplicity, we will be assuming the tcsh shell here.  If you aren’t already using it, you can open the tcsh shell by just typing:

tcsh

into a terminal prompt.  To set the shell permanently to tcsh, you should:

On the Duke neutrino computers (or if sshing to them):

Contact Barry and Jimmy at problem@phy.duke.edu, as only they have the administrator privileges necessary.  Give them your username and ask to have your default shell switched to tcsh.

On other computers:

Check with your administrators about how to change the shell.

Set the login script

You should create a file called .tcshrc in your home directory (~).  This “login script” contains a list of commands that execute when you login to a new “shell”.  You can create and/or edit this file using your favorite text editor.  At the very least, it should contain the following (assuming you are using the Duke computers):

setenv PROJECT /var/phy/project/hep/neutrino
source $PROJECT/soft-SL6/SK-Duke.login
setenv LD_LIBRARY_PATH $SKOFL_ROOT/lib:$ATMPD_ROOT/lib:$LD_LIBRARY_PATH
setenv TUTEXAMPLES /var/phy/project/hep/neutrino-data/projects/tutorials

On the Kamioka computers, the minimum is: 

source /usr/local/sklib_g77/cshenv_g77_skofl_16c+atmpd_16c
setenv TUTEXAMPLES /disk01/usr2/tutorials

You will note that, in addition to the lines necessary to run the software, we have also set an environment variable, $TUTEXAMPLES, which contains the path to the tutorial example data file directory.  That will be useful later.
This login script (which is hidden by default, as are all files whose names begin with a period) can be modified and customized as much as you like.  Example .tcshrc files, with comments describing what is going on, can be found for the Duke computers at:

/home/jba10/work/example.tcshrc

and for the Kamioka computers at:

/home/jalbert/.tcshrc

Feel free to borrow anything you like and copy it into your own .tcshrc (this is also good practice with the text editor).

Keep home and work separate

Lastly, it is a good idea to keep your home directory separate from your work directory (for a variety of reasons).  So let’s set up a work directory for you now!
Close first your terminal window and open a new one. From now on, any new terminal window will first execute your .tcshrc file and set up a bunch of environmental variable like $PROJECT used below.

On the Duke computers:

cd $PROJECT/work          move to the work directories
mkdir myusername          make a directory with your username
cd myusername             move to that directory
mkdir tutorials           now you have a subdirectory just for tutorial stuff

On the kamioka computers:

cd ~                      move to the home directory
mkdir work                make a work directory inside the home directory
cd work                   move to that work directory
mkdir tutorials           now you have a subdirectory just for tutorial stuff

One more thing… let’s make ROOT look pretty

When you start using ROOT, you’ll want to make your plots look nice, otherwise one of the Duke professors will go all HULK SMASH and break you.  You might want to set up the ROOT logon script stuff now.

Working Outside the Office

If you want to work on the tutorials from somewhere other than the machines in the physics department, you will need to do a bit of setup on your local machine.  If you are using OSX or Linux, you simply need to log in with X11 forwarding turned on from the command line:

ssh -YC <user>@neutrino-01.phy.duke.edu

You will typically want to have XQuartz on your local machine if you are working on a Mac.  If you are using Windows, you need to install an ssh client (suggested: putty) and an X11 server. X-Win32 is available for download through Duke OIT.   Once you have the xserver installed, start it up, and then use Putty to connect to neutrino-01.phy.duke.edu as above.

Now we’re ready to move on to the tutorials!

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