10-05-2012
First and foremost, Linux is not UNIX because it says so. The GNU system which Linux is a part of stands for "GNU's Not UNIX". They named GNU that to set it apart from the very expensive commercial UNIX distributions that were dominant at the time.
It's extremely similar. Folders and devices and networking works the same way. Not all the utilities are quite the same, configuration is different, and the kernel's features are still changing as its developers experiment.
On the other hand -- not even all UNIX is alike. It's really not that different.
What do you really need to know about Unix? I'd start with the Bourne shell and the concepts underlying it(directories, files, and so forth). That will be handy no matter where you go in UNIX and LINUX. You can boot an OS in virtualbox, install another hard drive and dual-boot, boot a Linux livecd for an environment that's hard to mess up -- it's a CD, you can't delete something by accident. Lots of ways.
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LEARN ABOUT SUSE
grub-install.unsupported
GRUB-INSTALL(8) FSF GRUB-INSTALL(8)
NAME
grub-install - install GRUB on your drive
SYNOPSIS
grub-install [OPTION] install_device
DESCRIPTION
Install GRUB on your drive.
-h, --help
print this message and exit
-v, --version
print the version information and exit
--root-directory=DIR
install GRUB images under the directory DIR instead of the root directory
--grub-shell=FILE
use FILE as the grub shell
--no-floppy
do not probe any floppy drive
--force-lba
force GRUB to use LBA mode even for a buggy BIOS
--recheck
probe a device map even if it already exists
INSTALL_DEVICE can be a GRUB device name or a system device filename.
grub-install copies GRUB images into the DIR/boot directory specfied by --root-directory, and uses the grub shell to install grub into the
boot sector.
The grub source distribution carries this script to ease the installation of grub as a boot loader. In Suse Linux however, grub installa-
tion is much better handled by Yast; use of this script is generally discouraged and therefore unsupported. Consequently, the script has
been renamed to grub-install.unsupported.
In order to (re-)install grub for the currently running system, simply use Yast. For an installation aiming at a differing system, the
crafting of an appropriate device.map and grub shell script is strongly advised, e.g. "grub --batch --device-map=target-device.map < tar-
get-grub.conf"
SEE ALSO
The full documentation for grub-install is maintained as a Texinfo manual. If the info and grub-install programs are properly installed at
your site, the command
info grub-install
should give you access to the complete manual.
grub-install (GNU GRUB 0.97) May 2005 GRUB-INSTALL(8)