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Full Discussion: Unix-based operating systems
Operating Systems Linux Fedora Unix-based operating systems Post 302363474 by pludi on Tuesday 20th of October 2009 11:16:19 AM
Old 10-20-2009
Let's see if I can help you a bit:
  1. There was, a long time ago, the one original AT&T UNIX. However, it's long been discontinued, with rights going through various hands (see the current Novell vs. SCO squabble). Sometime around the late 1970s, two different systems started to emerge: System V, and the Berkley Standard Distribution. Current Unices are based on those two. For a complete overview, Wikipedia has a pretty good article.
  2. If by "high-end" you mean "expensive closed-source company produced", you won't be able to buy these alone. Those usually come bundled with hardware, and aren't available without it (AIX, HP-UX, and MacOS X are examples of that).
    Deciding on what UNIX to use depends on what you want to do. If you want to develop in a wide range of languages, or using the most current hardware, I'd suggest Linux. If you want a stable system (both in terms of run-time and system behaviour), I'd suggest *BSD or OpenSolaris
  3. The hardware modern Intel-based Macs use is pretty much completely PC hardware, so it won't make any difference on stability. But I suggest setting up the new system on different hardware, since it won't be as much trouble should you need to re-install.
 

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DateTime::Format::Epoch::Unix(3pm)			User Contributed Perl Documentation			DateTime::Format::Epoch::Unix(3pm)

NAME
DateTime::Format::Epoch::Unix - Convert DateTimes to/from Unix epoch seconds SYNOPSIS
use DateTime::Format::Epoch::Unix; my $dt = DateTime::Format::Epoch::Unix->parse_datetime( 1051488000 ); # 2003-04-28T00:00:00 DateTime::Format::Epoch::Unix->format_datetime($dt); # 1051488000 my $formatter = DateTime::Format::Epoch::Unix->new(); my $dt2 = $formatter->parse_datetime( 1051488000 ); $formatter->format_datetime($dt2); DESCRIPTION
This module can convert a DateTime object (or any object that can be converted to a DateTime object) to the number of seconds since the Unix epoch. METHODS
Most of the methods are the same as those in DateTime::Format::Epoch. The only difference is the constructor. o new() Constructor of the formatter/parser object. It has no parameters. SUPPORT
Support for this module is provided via the datetime@perl.org email list. See http://lists.perl.org/ for more details. AUTHOR
Eugene van der Pijll <pijll@gmx.net> COPYRIGHT
Copyright (c) 2003 Eugene van der Pijll. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
DateTime datetime@perl.org mailing list perl v5.10.1 2007-12-03 DateTime::Format::Epoch::Unix(3pm)
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