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You should now be looking at the login prompt of a new Linux, just booted from your hard drive. Congratulations!
Depending on how the installation phase went, you may need to create accounts, change your hostname, or (re)configure X at this stage. There are many more things you could set up and configure, including backup devices, SLIP/PPP links to an Internet Service Provider, etc.
A good book on UNIX systems administration should help. (I suggest Essential Systems Administration from O'Reilly and Associates.) You will pick these things up as time goes by. You should read various other Linux HOWTOs, such as the NET-3-HOWTO and Printing-HOWTO, for information on other configuration tasks.
LILO is a boot loader, which can be used to select either Linux, MS-DOS, or some other operating system at boot time. Chances are your distribution automatically configured LILO for you during the installation phase (unless you're using OS/2, this is what you should have done). If so, you can skip the rest of this section.
If you installed LILO as the primary boot loader, it will handle the first-stage booting process for all operating systems on your drive. This works well if MS-DOS is the only other operating system that you have installed. However, you might be running OS/2, which has its own Boot Manager. In this case, you want OS/2's Boot Manager to be the primary boot loader, and use LILO just to boot Linux (as the secondary boot loader).
An important gotcha for people using EIDE systems: due to a BIOS limitation, your boot sectors for any OS have to live on one of the first two physical disks. Otherwise LILO will hang after writing "LI", no matter where you run it from.
If you have to configure LILO manually, this will involve editing the file /etc/lilo.conf. Below we present an example of a LILO configuration file, where the Linux root partition is on /dev/hda2, and MS-DOS is installed on /dev/hdb1 (on the second hard drive).
Once you have edited the /etc/lilo.conf file, run /sbin/lilo as root. This will install LILO on your drive. Note that you must rerun /sbin/lilo anytime that you recompile your kernel in order to point the boot loader at it properly (something that you don't need to worry about just now, but keep it in mind).
Note how we use the append option in /etc/lilo.conf to specify boot parameters as we did when booting the bootdisk.
You can now reboot your system from the hard drive. By default LILO will boot the operating system listed first in the configuration file, which in this case is Linux. In order to bring up a boot menu, in order to select another operating system, hold down shift or ctrl while the system boots; you should see a prompt such as
Here, enter either the name of the operating system to boot (given by the label line in the configuration file; in this case, either linux or msdos), or press tab to get a list.
Now let's say that you want to use LILO as the secondary boot loader; if you want to boot Linux from OS/2's Boot Manager, for example. In order to boot a Linux partition from OS/2 Boot Manager, unfortunately, you must create the partition using OS/2's FDISK (not Linux's), and format the partition as FAT or HPFS, so that OS/2 knows about it. (That's IBM for you.)
In order to have LILO boot Linux from OS/2 Boot Manager, you only want to install LILO on your Linux root filesystem (in the above example, /dev/hda2). In this case, your LILO config file should look something like:
Note the change in the boot line. After running /sbin/lilo you should be able to add the Linux partition to Boot Manager. This mechanism should work for boot loaders used by other operating systems as well.