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Introduction to Unix

What is Unix?

Unix is an operating system that runs on a number of Warwick servers and can be used for performing many functions. In particular Unix is necessary for storing files if you wish to create a web site at Warwick.

What else can Unix be used for?

Software packages available through Unix

How do I log in to Unix?

You can log into the Unix machine remotely using any SSH client program (e.g. PuTTY). An SSH client program establishes a secure channel to the Unix machine. The Unix machine available to login to is

On the ITS Managed Windows 7 Desktop, the PuTTY SSH client is available.

If you wish to run an X Windows session on the Unix machine, NX Client or Exceed are available on the ITS Managed Windows 7 Desktop. Please ensure when accessing that under Options, Session, CDE is chosen as the desktop environment.

You can log into the Unix machine using your normal ITS username and password.

What is my file quota on Unix and how do I check it?

All quota is 1 GB by default.

If you exceed your quota, you will be warned and required to remove files.

To check your Unix quota, login to Unix through your SSH Client, and type quota –v at the prompt. This lists Usage and Quotas (in KB).

What happens if I go over my quota limit on Unix?

When you go over quota you may well experience problems logging in, therefore the recommendation is to regularly check your quota and delete any unnecessary files if you are close to you quota limit. If you are unfortunate enough to exceed you disk quota and can no longer log in then you need to ring the ITS Helpdesk.

How do I remove files from my Unix account?

This should only be done if you know which files you wish to remove and understand the consequences. You should never remove .files eg .cshrc, .bashrc or .login as these are necessary system files and will stop your Unix account working correctly.

Some useful Unix commands are:



This displays the amount of space used by each folder so that you
can see which has the most data in it.



Lists all files in a folder.

ls –lags


Lists all files in long format.

| more


Breaks long lists into sections. Scroll down using enter.

cd <directory name>


Change directory.

cd ~


Takes you back to home directory level.

rm <filename>


Removes a file.

mkdir <dir. name>


Create a new directory

rmdir <dir. name>


Delete a directory

Please note that all commands and filenames in Unix are case-sensitive – Mkdir is not the same as mkdir and will not work.

How do I create a web page at Warwick?

Please see Leaflet 16b for information on web page creation and Leaflet 15 for information on File Transfer to Unix.

NB: Your Unix account is discontinued when you leave the University and your website will no longer be visible.