06-07-2006
UNIX is a family of operating systems and a superset that includes Linux. There's no one single "UNIX" operating system exist, rather there are many systems that fit into family due to of core conceptions they implement. All systems of the family, including Linux of cause, share same set of basic commands, such as for file operations, editing, shells etc. However more complex issues such as system management and volume management are different as they reflect the differences in implementations and trends for brand oriented hardware.
There are many systems that you can get essentially for free: FreeBSD, Open BSD, some Linuxes and so on. Essentially, UNIX is a different OS and it may coexist with Windows on the same machine for education purposes. You can dedicate one partition to it and install any of aforementioned. If you really really new, I would recommend Mandrake Linux as it is most polished and has very convenient tools for automatic installations for beginner.
Get "UNIX Essentials and UNIX Core" DVD if you are going learn this stuff.
Hope it helps.
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LEARN ABOUT CENTOS
uml_switch
UML_SWITCH(1) General Commands Manual UML_SWITCH(1)
NAME
uml_switch -- switch daemon for user-mode Linux
SYNOPSIS
uml_switch [-unix control_socket data_socket] [-hub] [-tap tun device] [-compat-v0] [-daemon]
DESCRIPTION
This manual page documents briefly the uml_switch program.
This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page.
uml_switch is a daemon for managing a virtual network between user-mode Linux systems, with no connection to the host system's network.
It will listen for connections on a pair of UNIX domain sockets, and forward packets between clients which connect to them.
OPTIONS
-unix control_socket data_socket
Listen on the specified pair of sockets, instead of the defaults.
-hub Act like a hub. This means that packets received will be broadcast over all virtual links. The default is to act as a switch,
where packets are only sent to the link matching the destination MAC address of the packet.
-tap tap device
Connect the switch to a dynamically created tap device on the host
-compat-v0
Specify control protocol version 0 compatibility.
-daemon Run in the background as a daemon.
SEE ALSO
linux(1)
The UserModeLinux-HOWTO (link to URL http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO.html)
AUTHOR
uml_switch was written by Jeff Dike and others.
This manual page was written by Matt Zimmerman mdz@debian.org for the Debian GNU/Linux system (but may be used by others). Permission is
granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later
version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
UML_SWITCH(1)