LINUX 

The terminals in the computer lab are connected to a central server running on LINUX.
Your login ID is your roll number. The password is also the roll number. You can change
the password with the following command:

passwd (you may be asked for the existing and new passwords)                    

                        Remember linux is case sensitive!

Create a new folder (directory) with
mkdir  <folder name>

Change folder with
cd  <folder name>
- for folder name will change to the previous directory

pwd  will show the current folder

List the files in the folder with
ls
There are several options for this. For example, you get a long listing with
ls -l

Display a file with
cat  <file name>

Display long files, one screen at a time with
more  <file name>

Copy file to another file with
cp <file name> <file name>

Rename (move) a file with
mv <file name> <file name>

Delete a file with
rm  <file name>

Delete a folder with
rmdir <folder name>

For a complete list of commands and all options under each command see:
http://ss64.com/bash/


The vi EDitor:

You will be using the vi editor which is part of every LINUX installation for
creating and editing files. You invoke vi as follows:

vi <file name>

vi has two modes: insert mode and command mode. The command mode is active when you
start vi. To insert text (and lines) you issue the following commands:

i             :insert text at cursor
I             :insert text at beginning of line
0             :open line above cursor
O             :open line below cursor

Switch to command mode from insert mode with
Esc

Use the following command to save your file and quit
:wq

Read more about vi at:
http://ss64.com/vi.html


To run FORTRAN-77 compiler your fortran program file should have the extension .f.
That is, the file should be like filename.f

Command to run the compiler:

f77 filename.f

If the program compiles without errors it would have created an executable
file,  a.out.  You can run it by typing:
./a.out