You will have been given a username (tutoxx) and a password. Users tuto01 to tuto10 should connect to the head node cecamsrv4.epfl.ch and users tuto11 to tuto16 should connect to cecampc4.epfl.ch.
Do not run pwscf jobs on the head node! To run jobs we will connect to a specific node (more later). But stay on the head node for this inital tutorial
Let's make the connection
[Student-16:~] che721% ssh -Y firstname.lastname@example.org Password: Password: Last login: Mon Sep 21 14:10:03 2009 from 22.214.171.124 Have a lot of fun...
Step 1 - Copying the examples into a working area
Firstly, let's create a temporary working area to do the examples in. This is usually a good idea for every distinct problem you're working on as it keeps things tidy and manageable. We'll create a directory (or "folder" in Windows parlance) called "examples" using the Linux command "mkdir":
Now check that your intro directory has been made properly by listing the directory (or folder) you are already in:
and you should see a list of files and directories including the new examples directory. Now let's "move" into that directory:
Note that "cd" is the Linux command for changing directories. You can move back to your home directory at any time by typing "cd" just on its own. You can check your current directory at anytime with the "pwd command":
If you run "ls" in the examples directory, nothing is listed as there are no files yet (try it). Let's copy the example code from one directory (provided by the tutors) to your current location. Note the space before the "." :
user@cecamsrv4:~>cp ../gipaw_day1.tgz .
Do NOT forget the "." character. To Linux this means "my current directory". So you are copying (with the "cp" command) the file gipaw_day1.tgz from the directory one below your current position to your current directory. Now try an "ls" to see what you've got. You should see:
This file is an archive containing lots of files and directories. We need to unpack it
user@cecamsrv4:~> tar -zxvf gipaw_day1.tgz
Now when you list the files you should see a directory call 'gipaw_day1'. Move into this directory, and list the files
user@cecamsrv4:~> ls README ex1 ex2 ex3 ex4
To look at the files you can use the command called more (similar commands are cat and less)
user@cecamsrv4:~> more README
Editing a file
Edit the README file. To do this you will need to use an editor. (for experts 'vi' and 'emacs' are available). Otherwise I suggest using an editor call nano. This has helpful list of instructions are the bottom of the screen (but ask if you are confused!)
You are now ready to move onto the first tutorial
END of TUTORIAL
Summary of useful commands
mv rename (or move) a file eg 'mv oldfile newfile' cp copy a file eg 'mv original copy' pwd print current (working) directory mkdir make a new directory (aka folder) nano a file editor eg 'nano filename' note you can use this to edit an existing file, or to create a new file. eg 'nano mynewfile' will create a new file called 'mynewfile' ls list files in the current directory ls -l list files - but give more details than plain ls exit to close the terminal when you are finished cp fred/* jim/ copy all the files in the folder fred into the folder jim cp ../myfile ./ copy the file myfile in the folder below to the current folder cp ~/myfile ./ copy the file myfile in your home folder to the current folder