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CIS Tutorials

Unix Tutorial One

Step 1: Listing files and directories

ls (list)

When you first login, your current working directory is your home directory. Your home directory has the same name as your user-name, for example, ee91ab, and it is where your personal files and subdirectories are saved.

To find out what is in your home directory, type:

ls

The ls (short for list) command lists the contents of your current working directory.

There may be no files visible in your home directory, in which case, the UNIX prompt will be returned. Alternatively, there may already be some files inserted by the System Administrator when your account was created.

ls does not, in fact, cause all the files in your home directory to be listed, but only those ones whose name does not begin with a dot (.) Files beginning with a dot (.) are known as hidden files and usually contain important program configuration information. They are hidden because you should not change them unless you are very familiar with UNIX!!!

To list all files in your home directory including those whose names begin with a dot, type:

ls -a

ls is an example of a command which can take options: -a is an example of an option. The options change the behaviour of the command. There are online manual pages that tell you which options a particular command can take, and how each option modifies the behaviour of the command. (See later in this tutorial.)

Step 2: Making Directories

mkdir (make directory)

We will now make a subdirectory in your home directory to hold the files you will be creating and using in the course of this tutorial. To make a subdirectory called cs1 in your current working directory type:

 mkdir cs1

To see the directory you have just created, type:

ls

Step 3: Changing to a different directory

cd (change directory)

The command cd directory means “change the current working directory to ‘directory’. The current working directory may be thought of as the directory you are in, i.e. your current position in the file-system tree.

To change to the directory you have just made, type:

 cd cs1

Type ls to see the contents (which should be empty).

Exercise:

Make another directory inside the cs1 directory called backups

Step 4: The directories . and ..

Still in the cs1 directory, type:

ls -a

As you can see, in the cs1 directory (and in all other directories), there are two special directories called “.” and “..”

In UNIX, “.” means the current directory, so typing:

 cd . //NOTE: there is a space between **cd** and the dot

means stay where you are (the cs1 directory). This may not seem very useful at first, but using “.” as the name of the current directory will save a lot of typing, as we shall see later in the tutorial.

”..” means the parent of the current directory, so typing:

cd ..

will take you one directory up the hierarchy (back to your home directory). Try it now.

Note: typing cd with no argument always returns you to your home directory. This is very useful if you are lost in the file system.

Step 5: Pathnames

pwd (print working directory)

Pathnames enable you to work out where you are in relation to the whole file-system. For example, to find out the absolute pathname of your home-directory, type cd to get back to your home-directory and then type:

 pwd

The full pathname will look something like this:
/home/students/ffeng/cs1

which means that ffeng (suppose your acount id is ffeng) is in the directory students (the group directory), which is located under directory home.

Note:
/home/students/ffeng/cs1

can be shortened to:
~ffeng/cs1

i.e., the cs1 subdirectory located under the home directory of user ffeng.

Exercise:

Use the commands ls, pwd and cd to explore the file system.
(Remember, if you get lost, type cd by itself to return to your home-directory.)

Step 6: More about home directories and pathnames

Understanding pathnames

First type cd to get back to your home-directory, then type:

% ls cs1

to list the conents of your cs1 directory.

Now type:

% ls backups

You will get a message like this -
backups: No such file or directory

The reason is, backups is not in your current working directory. To use a command on a file (or directory) not in the current working directory (the directory you are currently in), you must either cd to the correct directory, or specify its full pathname. To list the contents of your backups directory, you must type:

% ls cs1/backups

~ (your home directory)

Home directories can also be referred to by the tilde ~ character. It can be used to specify paths starting at your home directory. So typing:

% ls ~/cs1

will list the contents of your cs1 directory, no matter where you currently are in the file system.

What do you think

% ls ~

would list?

What do you think

% ls ~/..

would list?

Summary

  • ls : list files and directories
  • ls -a : list all files and directories
  • mkdir : make a directory
  • cd directory : change to named directory
  • cd : change to home-directory
  • cd ~ : change to home-directory
  • cd .. : change to parent directory
  • pwd : display the path of the current directory

M.Stonebank@surrey.ac.uk
© 9th October 2000
Adapted by Xiaolan Zhang based on http://www.math.montana.edu/help/software/unixtut/unix1.html