Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual download pdf (Page 225)

15.10 What is Rescue Mode? 213

In detail, the above command “sends” the output of the manual page entry through the col ﬁlter,

which helps format the output for the printer. Then, the output from col is sent to the printer. This

is called piping, and you can learn more about it in Chapter 16 on page 217.

15.10 What is Rescue Mode?

Rescue mode is a term used to describe a method of booting a small Linux environment completely

from diskettes.

What follows in this section may help you recover from a problem at some point. A copy of these

instructions is also available as rescue.txt on your Red Hat Linux 6.0 CD-ROM.

As the name implies, rescue mode is there to rescue you from something. In normal operation,

your Red Hat Linux system uses ﬁles located on your system’s hard drive to do everything – run

programs, store your ﬁles, and more.

However, there may be times when you are unable to get Linux running completely enough to access

its ﬁles on your system’s hard drive. By using rescue mode, it’s possible to access the ﬁles stored on

your system’sharddrive,evenifyoucan’t actually run Linux from that hard drive.

Normally, you’ll need to get into rescue mode for one of two reasons:

You are unable to boot Linux, and you’d like to ﬁxit.

You are having hardware or software problems, and you want to get a few important

ﬁles off your system’sharddrive.

Let’s take a closer look at each these scenarios.

Unable to boot Linux – Many times this is caused by the installation of another operating system

after you’ve installed Red Hat Linux. Some other operating systems assume that you have no other

operating systems on your computer, and overwrite the Master Boot Record (or MBR) that originally

contained the LILO bootloader. If LILO is overwritten in this manner, you’re out of luck – unless you

can get into rescue mode.

Hardware/software problems – There can be as many different situations under this category

as there are systems running Linux. Things like failing hard drives and forgetting to run LILO after

building a new kernel are just two things than can keep you from booting Red Hat Linux. If you can

get into rescue mode, you might be able to resolve the problem – or at least get copies of your most

important ﬁles.

What do you need to get into rescue mode?

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual Page 225