Hydra can be accessed from the computer labs on campus particularly the Wells Computer Center in the Classroom South building in room 109. You can also access hydra using a modem from your home. Computer consulants are available at the Wells Computer Center 24 hrs to assist you either in the lab or help on using the modem. Particularly you can get the dial-in numbers for hydra from here and numerous other hand-outs. The phone number of the Wells Computer Center is 404-651-4542.
Use the user ids given to you once you get the login prompt and press enter and then the password.
Here we give a brief introduction to the necessary UNIX commands. Use man command to see manual pages, and man man to learn about man itself. man -k keyword will list all available commands which relate to the keyword.
The directory structure of IRIX is similar to DOS. We can create a tree of directories and access them with pathnames. Concept of a path is also same as in DOS except that the 'character in DOS is replaced by '/'. For example a typical path in DOS is given as
\usr\binwhereas in IRIX it is given as /usr/bin .
Absolute path to a file or a directory starts with a root directory /. For example the path /usr/include/stdio.h is an absolute path to the file stdio.h because it starts with root directory.
Relative path to a file or a directory does not start with root directory but it is relative to the present directory we are in.
For example let us assume that we are already in /usr directory. Now relative path to the file stdio.h in the include directory is include/stdio.h. Notice that in a path if we do not have first character as / then present directory is taken as the starting point.