09-05-2002
Linux, FreeBSD, Solaris, HP/UX, AIX, and other systems are collectively called UNIX-like systems. They all, practically speaking, conform to the standard (usually called POSIX) that is one good working definition of "UNIX-like."
(UNIX used to be a trademark that applied only to systems distributed by AT&T, but now it's part of a branding program that can be applied to any system that meets certain standards and otherwise qualifies according to the trademark owner, The Open Group.)
FreeBSD is indeed inside Mac OS X. However, it's invisible to the average Mac user. But, it's there, and more advanced users can get to it.
If you're after basic knowledge, reading up on the topic of "UNIX" will provide background for all of these systems, although not for the non-UNIX-like parts of Mac OS X. Beyond that, reading up on the specific systems you're using (e.g., Linux) make sense. For system administration, you can get even narrower, reading up on the brand-specific stuff (e.g., SuSE Linux).
Hope this helps...
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LEARN ABOUT OPENSOLARIS
lx
lx(5) Standards, Environments, and Macros lx(5)
NAME
lx - Linux branded zone
DESCRIPTION
The lx brand uses the branded zones framework described in brands(5) to enable Linux binary applications to run unmodified on a machine
with a Solaris Operating System kernel.
The lx brand includes the tools necessary to install a CentOS 3.x or Red Hat Enterprise Linux 3.x distribution inside a non-global zone.
The brand supports the execution of 32-bit Linux applications on x86/x64 machines running the Solaris system in either 32-bit or 64-bit
mode.
Supported Linux Distributions
The lx brand emulates the system call interfaces provided by the Linux 2.4.21 kernel, as modified by Red Hat in the RHEL 3.x distributions.
This kernel provides the system call interfaces consumed by the glibc version 2.3.2 released by Red Hat.
In addition, the lx brand partially emulates the Linux /dev and /proc interfaces.
Configuration and Administration
The lx brand supports the whole root non-global zone model. All of the required linux packages are installed into the private file systems
of the zone.
The zonecfg(1M) utility is used to configure an lx branded zone. Once a branded zone has been installed, that zone's brand cannot be
changed or removed. The zoneadm(1M) utility is used to report the zone's brand type and administer the zone. The zlogin(1) utility is used
to log in to the zone.
Application Support
The lx zone only supports user-level Linux applications. You cannot use Linux device drivers, Linux kernel modules, or Linux file systems
from inside an lx zone.
You cannot add any non-standard Solaris devices to a Linux zone. Any attempt to do so will result in a zone that zonecfg(1M) will refuse to
verify.
You cannot run Solaris applications inside an lx zone. Solaris debugging tools such as DTrace (see dtrace(1M)) and mdb (see mdb(1)) can be
applied to Linux processes executing inside the zone, but the tools themselves must be running in the global zone. Any core files generated
are produced in the Solaris format, and such files can only be debugged with Solaris tools.
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWlxr, SUNWlxu |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
SEE ALSO
mdb(1), zlogin(1), zonename(1), dtrace(1M), zoneadm(1M), zonecfg(1M), brands(5), zones(5), lx_systrace(7D)
SunOS 5.11 19 Sep 2006 lx(5)