Commands leave 'notes' for programs (such as printing) that are 'buried' in the Unix system.
This is so that one user does not hog one program, many people can access it. An Absolute Pathname starts from the root directory e.g. The Relative pathname points to a file or directory that is relative to the position that you are in within the directory tree and this does not start with a /.
Nowadays, when you are confronted with a Unix box you will come across an X-windows interface.
Minimising a window is achieved by 'left-clicking' on the top left corner of the menu bar and selecting close. kill the process which has been given the temporary number 5173.
This process number is found by using the ps command.
Do not use kill 1 as this kills the system scheduler!
There are numerous flavours of Unix; AIX (IBM), Solaris (SUN), Xenix, Linux etc. Unix often comes with a number of command shells, e.g.
Bourne Shell ($ prompt) or C shell (% prompt with enhancements on the Bourne Shell) or Korn shell ($ prompt) which have slightly differing command syntax, although principally they are the same. The 'Tea Sea Shell' (tcsh) is often used in the Linux environment and contains useful attributes such as 'up-arrow' and 'down-arrow' recall of previous command entries, and the use of the TAB key to complete commands (much like the Cisco IOS! The shell interprets commands with the operating system kernel.
The beauty of Unix is that hundreds of people can access one box at once and each one can run a number of programs, a separate shell opens for each log on that occurs, and each user can have a completely different 'environment' setup, different colours, priviledges, file and directory access and different shell.
Every Unix command or filename is case sensitive, unlike DOS, this is the most common error to be aware of.
In the list of programs that appear select either shell or command to open a command line window (much like a DOS box in Microsoft Windows). takes you up one directory, whereas typing cd ../user/dave, takes you up one directory and then right down to the '/user/dave' directory.
You normally need to click on the title bar or border before you can type in the window, sometimes the X-window interface has been set up such that the mouse moving over the window is enough to highlight the box. Typing cd without a path takes you back to your home directory, i.e. Means change shell and changes the shell that the user is using.
Any number of these command line windows can be opened. The user will be prompted for a password since the 'passwd' file is being changed, then the user will need to type the path to the shell e.g. This lists the jobs running under the current shell in 'job ID' order.
Resizing them is achieved by selecting the bottom right hand corner with the left mouse button (a circle appears) and dragging the window edges to the required size. You can type bg %jobid to put a particular job running in the background. Typing fg %jobid brings the job back to the foreground.