|Red Hat Linux 7.2: The Official Red Hat Linux Getting Started Guide
|Chapter 10. Shell Prompt Basics
When you are logged in as root, you might want to take a few minutes to create a fresh boot disk or copy the boot disk you already have.
There are a number of reasons you should make a boot disk. It can help you recover from a system failure, it can help you test a new kernel you have downloaded and compiled, and it can help you share your computer with more than one operating system.
You were given the opportunity to make a boot disk when you installed Red Hat Linux. If you chose not to make a boot disk at installation, here is your chance to start from scratch.
To create a boot disk:
Go to a shell prompt and make sure you are logged in as root. At the shell prompt, if you see something like [newuser@localhost newuser]$, for example, type:
[newuser@localhost newuser]$ su - Password: yourrootpassword [root@localhost newuser]#
Put a standard diskette in the floppy drive.
|Naming The Floppy Drive
In Linux, the floppy drive is referred to as /dev/fd0.
If you have previously used the diskette, remember that you will lose everything on the diskette!
At the prompt, type:
Your kernel version will be displayed. The kernel is the heart of any Linux system. Your kernel version will be something similar to:
There will be several numbers after 2.4, for example: 2.4.1).
Now that you have found the kernel version, you can tell the mkbootdisk command which kernel to copy to your diskette.
Type the following command:
mkbootdisk --device /dev/fd0 2.4.x-yy
If you do not tell mkbootdisk where to copy the kernel, it will default to copying to the diskette in /dev/fd0.
|Clearing The Screen
If your screen becomes crowded, you can always start with a clean slate by typing clear at the prompt.
|The su and su - Commands
The command su means substitute users, and it lets
you temporarily log in as another user. When you type
su all by itself and press