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Full Discussion: How is OS X related to unix
Operating Systems Linux Fedora How is OS X related to unix Post 302311791 by Neo on Wednesday 29th of April 2009 02:13:32 PM
Old 04-29-2009
OS X is not Linux-based, it is UNIX/BSD based.

Reference: Darwin

Quote:
Darwin is an open source POSIX-compliant computer operating system released by Apple Inc. in 2000. It is composed of code developed by Apple, as well as code derived from NEXTSTEP, FreeBSD, and other free software projects.

Darwin forms the core set of components upon which Mac OS X and iPhone OS are based. It is compatible with the Single UNIX Specification version 3 (SUSv3) and POSIX UNIX applications and utilities.
 

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IPSEC(8)							Executable programs							  IPSEC(8)

NAME
ipsec - invoke IPsec utilities SYNOPSIS
ipsec command [argument...] ipsec --help ipsec --version ipsec --versioncode ipsec --copyright ipsec --directory ipsec --confdir DESCRIPTION
Ipsec invokes any of several utilities involved in controlling the IPsec encryption/authentication system, running the specified command with the specified arguments as if it had been invoked directly. This largely eliminates possible name collisions with other software, and also permits some centralized services. ipsec --help lists the available commands. Most have their own manual pages, e.g. ipsec_auto(8) for auto. ipsec --version outputs version information about Linux FreeS/WAN. A version code of the form ``Uxxx/Kyyy'' indicates that the user-level utilities are version xxx but the kernel portion appears to be version yyy (this form is used only if the two disagree). ipsec --versioncode outputs just the version code, with none of --version's supporting information, for use by scripts. ipsec --copyright supplies boring copyright details. ipsec --directory reports where ipsec thinks the IPsec utilities are stored. ipsec --confdir reports where ipsec thinks the IPsec configuration files are stored. FILES
/usr/local/lib/ipsec usual utilities directory SEE ALSO
ipsec.conf(5), ipsec.secrets(5), ipsec_auto(8), ipsec_barf(8), ipsec_setup(8), ipsec_showhostkey(8) HTML documentation shipped with the release, starting with doc/index.html. <http://www.freeswan.org/doc.html> may also be of use. HISTORY
Written for Linux FreeS/WAN <http://www.freeswan.org> by Henry Spencer. BUGS
The provision of centralized services, while convenient, does compromise the original concept of making the utilities invocable directly as well as via ipsec. AUTHOR
Paul Wouters placeholder to suppress warning libreswan 12/29/2012 IPSEC(8)
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