HANDS-ON SESSION

MAE-185

Prof. Donald Dabdub

· How do I access my ea account?

Usually, once you login into a computer in Lab C (assuming you already activated your ucinetid account) there should be an icon that allows you to connect to EA. Double-click on it and logon with the same username (ucinetid) and password you used before. Your account on ea uses a unix-type operating system. Unix is case sensitive which means that any command should be typed as appears below, otherwise will not work.

· Use of ls Unix command

ls lets you see the content of your home directory

Example:

ea>ls

mail/ myfile1* somethinghere.txt

in this case you see a directory (that should contain your email), an executable file (that is what the asterisk means), and a plain text file.

· Create a new directory

To do so, you will need the mkdir command as follows:

ea>mkdir mae10

ea>ls

mae10/ mail/ myfile1* somethinghere.txt

here you have created the mae10 directory.

· Use of cd Unix command

To move under that directory you will need the cd command:

ea> cd mae10

ea>ls

at this point you should have moved under mae10 and because it was just recently created there should be nothing there. If you use cd again you should come back to your home directory (default behavior):

ea>cd

ea>ls

mae10/ mail/ myfile1* somethinghere.txt

HANDS-ON SESSION

MAE-185

Prof. Donald Dabdub

· Create a file (your first fortran program)

Move back under the mae10 directory that you just created (ea>mv mae10). There are two popular text editors in Unix: vi and emacs, I would highly recommend you learn one of them. In your accounts there is a third option called pico which is much simpler and would do the work for the editing of your codes in this course. Create a file and name it hello.f (hello is the name and .f is the extension which in this case means fortran 77 file)

ea>pico hello.f

you should see a screen with commands at the bottom, you can type your code now:

c23456789

program hello

c This is the simplest code in fortran and writes the word hello on the screen

write(*,*) 'hello world'

end

Save it with Ctrl-o (all the other commands are Ctrl-the_indicated_letter_at_bottom ) and exit Ctrl-x

· Compile your program

The compiler available in your account is called f77. Type

ea>f77 -o hola hello.f

hello.f:

MAIN hello:

The flag -o tells the compiler to create an executable named hola. When you run this

ea>hola

hello world

it puts the message on the screen as expected.

· Other useful commands

rm : remove a file. ea>rm hola

mv : move (rename) a file. ea>mv hola wassup renames hola to wassup

ea>mv hola mydir/ moves hola under directory mydir

pine: mail client on your unix account. This can help you to attach files and send them to your grader. Remember that to attach a file you use Ctrl-j in the compose message screen.