Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 61)

Chapter 3. Boot Process, Init, and Shutdown 61

id:3:initdefault:

The default runlevel is 3 in this example, the number after the ﬁrst colon. If you want to change it, you

can edit /etc/inittab by hand. Be very careful when you are editing the inittab ﬁle as typos can

cause your system to become unbootable without a using a boot diskette or going into rescue mode.

If you use LILO as your boot loader, you can ﬁx the inittab ﬁle by rebooting, accessing the boot:

prompt with [Ctrl]-[X], and typing:

boot: linux single

If you are using GRUB as your boot loader, you can ﬁx the inittab ﬁle with the following steps.

• In the graphical GRUB boot loader screen, select the Red Hat Linux boot label and press [e] to

edit it.

• Arrow down to the kernel line and press [e] to edit it.

• At the prompt, type single and press [Enter].

• You will be returned to the GRUB screen with the kernel information. Press the [b] key to boot the

system into single user mode.

Tip

It is also possible to change runlevels at boot-time with GRUB using the same method as above

except replacing single with, for example, 3 or 5. The rest of the steps are exactly as they are shown

above.

This should allow you to boot into single-user mode so you can re-edit inittab to its previous value.

Next, we will discuss information in the ﬁles within the /etc/sysconfig/ directory which deﬁne

the parameters used by different system services when they start up.

3.3. Sysconﬁg Information

The following information outlines some of the various ﬁles in the /etc/sysconfig/ directory, their

function, and their contents. This information is not intended to be complete, as many of these ﬁles

have a variety of options that are only used in very speciﬁc or rare circumstances.

3.3.1. Files in the /etc/sysconfig/ Directory

The following ﬁles are normally found in /etc/sysconfig/:

• amd

• apmd

• arpwatch

• authconfig

• cipe

• clock

• desktop

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 61