Search the FAQ Archives

3 - A - B - C - D - E - F - G - H - I - J - K - L - M
N - O - P - Q - R - S - T - U - V - W - X - Y - Z
faqs.org - Internet FAQ Archives

Unix - Frequently Asked Questions (6/7) [Frequent posting]
Section - Main Unix flavors.

( Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Single Page )
[ Usenet FAQs | Web FAQs | Documents | RFC Index | Airports ]


Top Document: Unix - Frequently Asked Questions (6/7) [Frequent posting]
Previous Document: A very brief look at Unix history.
Next Document: Main Players and Unix Standards.
See reader questions & answers on this topic! - Help others by sharing your knowledge
Date: Mon Jan  9 16:59:14 EST 1995
X-Version: 2.7

6.3)  Main Unix flavors.

      The following is very much an early '90s view.

      Until recently, there were basically two main flavors of Unix:
      System V (five) from AT&T, and the Berkeley Software Distribution
      (BSD).  SVR4 is essentially a merge of these two flavors.  End
      '91, OSF/1 from the Open Software Foundation was released (as a
      direct competitor to System V) and may (future will tell) change
      this picture.

      The following lists the main releases and features of System V,
      BSD and OSF/1.

      System V from AT&T.  Typical of Intel hardware.  Most often
         ported Unix, typically with BSD enhancements (csh, job
         control, termcap, curses, vi, symbolic links).  System V
         evolution is now overseen by Unix International (UI).  UI
         members include AT&T, Sun, ....
         Newsgroup: comp.unix.sysv[23]86.  Main releases:

         - System III (1982): first commercial Unix from AT&T
           - FIFOs (named pipes)  (later?)

         - System V (1983):
           - IPC package (shm, msg, sem)

         - SVR2 (1984):
           - shell functions (sh)
           - SVID (System V Interface Definition)

         - SVR3 (1986) for ? platforms:
           - STREAMS (inspired by V8), poll(), TLI (network software)
           - RFS
           - shared libs
           - SVID 2
           - demand paging (if hardware supports)

         - SVR3.2:
           - merge with Xenix (Intel 80386)
           - networking

         - SVR4 (1988), mainstream of Unix implementations, merge of
           System V, BSD, and SunOS.
           - From SVR3: sysadmin, terminal I/F, printer (from BSD?),
             RFS, STREAMS, uucp
           - From BSD: FFS, TCP/IP, sockets, select(), csh
           - From SunOS: NFS, OpenLook GUI, X11/NeWS, virtual memory
             subsystem with memory-mapped files, shared libraries
             (!= SVR3 ones?)
           - ksh
           - ANSI C
           - Internationalization (8-bit clean)
           - ABI (Application Binary Interface -- routines instead of traps)
           - POSIX, X/Open, SVID3

         - SVR4.1
           - async I/O (from SunOS?)

         - SVR4.2 (based on SVR4.1ES)
           - Veritas FS, ACLs
           - Dynamically loadable kernel modules

         - Future:
           - SVR4 MP (multiprocessor)
           - Use of Chorus microkernel?

      Berkeley Software Distribution (BSD).  Typical of VAXen, RISCs,
         many workstations.  More dynamic, research versions now than
         System V.  BSD is responsible for much of the popularity of
         Unix.  Most enhancements to Unix started here.  The group
         responsible at UCB (University of California at Berkeley) is
         the Computer System Research Group (CSRG).  They closed down
         in 1992.  Newsgroup: comp.unix.bsd.  Main releases:

         (much reorganized wrt dates and releases, hope it's converging)

         - 2.xBSD (1978) for PDP-11, still of significance? (2.11BSD
           was released in 1992!).
           - csh

         - 3BSD (1978):
           - virtual memory

         - 4.?BSD:
           - termcap, curses
           - vi

         - 4.0BSD (1980):

         - 4.1BSD (?): base of later AT&T CRG versions
           - job control
           - automatic kernel config
           - vfork()

         - 4.2BSD (1983):
           - TCP/IP, sockets, ethernet
           - UFS: long file names, symbolic links
           - new reliable signals (4.1 reliable signals now in SVR3)
           - select()

         - 4.3BSD (1986) for VAX, ?:
         - 4.3 Tahoe (1988): 4.3BSD with sources, support for Tahoe
           (32-bit supermini)
           - Fat FFS
           - New TCP algorithms
         - 4.3 Reno (1990) for VAX, Tahoe, HP 9000/300:
           - most of P1003.1
           - NFS (from Sun)
           - MFS (memory file system)
           - OSI: TP4, CLNP, ISODE's FTAM, VT and X.500;  SLIP
           - Kerberos

         - Net1 (?) and Net2 (June 1991) tapes: that portion of BSD which
           requires no USL copyright

         - 4.4BSD (alpha June 1992) for HP 9000/300, Sparc, 386, DEC, others;
           neither VAX nor Tahoe; two versions, lite (~Net2 contents plus,
           fixes and new architectures) and encumbered (everything, requires
           USL license):
           - new virtual memory system (VMS) based on Mach 2.5
           - virtual filesystem interface, log-structured filesystem, size
             of local filesystem up to 2^63, NFS (freely redistributable,
             works with Sun's, over UDP or TCP)
           - ISO/OSI networking support (based on ISODE): TP4/CLNP/802.3 and
             TP0/CONS/X.25, session and above in user space;  FTAM, VT, X.500.
           - most of POSIX.1 (esp. new terminal driver a la SV), much of
             POSIX.2, improved job control; ANSI C headers
           - Kerberos integrated with much of the system (incl. NFS)
           - TCP/IP enhancements (incl. header prediction, SLIP)
           - important kernel changes (new system call convention, ...)
           - other improvements: FIFOs, byte-range file locking
           Official 4.4BSD release was expected within 6 months of above.

      The Open Software Foundation (OSF) released its Unix called OSF/1
         end of 1991.  Still requires an SVR2 license.
         Compatible/compliant with SVID 2 (and 3 coming), POSIX,
         X/Open, etc..  OSF members include Apollo, Dec, HP, IBM, ....

         - OSF/1 (1991):
           - based on Mach 2.5 kernel
           - symmetric multiprocessing, parallelized kernel, threads
           - logical volumes, disk mirroring, UFS (native), S5 FS, NFS
           - enhanced security (B1 with some B2, B3; or C2), 4.3BSD admin
           - STREAMS, TLI/XTI, sockets
           - shared libs, dynamic loader (incl. kernel)
           - Motif GUI

         - Release 1.3 (Jun 94)
           - Based on MACH 3.0 Micro-kernel
           - Conformant with current draft of Specification 1170
             (considered for standardization in X/Open's Fast Track process)
           - Data Capture I/F, Common Data Link I/F,
           - ISO 10646 and 64-bit support.
           - OSF/1 MK (mikrokernel) based on Mach 3.0

      This list of major flavors should probably also include Xenix
      (Microsoft) which has been the basis for many ports.  Derived from V7,
      S III and finally System V, it is similar externally but significantly
      changed internally (performance-tuned for micros).


      Two very good books describe the internals of the two main flavors.
      These are:
      - System V: "Design of the Unix Operating System", M.J. Bach.
      - BSD: "Design and Implementation of the 4.3BSD Unix Operating System",
        Leffler, McKusick, Karels, Quaterman.
      For a good introduction to OSF/1 (not quite as technical as the
      previous two), see: "Guide to OSF/1, A Technical Synopsis",
      published by O'Reilly.  On SunOS, "Virtual Memory Architecture in
      SunOS" and "Shared Libraries in SunOS" in Summer 1989 USENIX
      Proceedings.

      A good set of articles on where Unix is going is "Unix Variants"
      in the Apr 92 issue of Unix Review.  Other good sources of
      information include the bsd-faq file, and many of the newsgroups
      mentioned in the text.

User Contributions:

Hello ... Im looking a lover..
I love oral sex! Write me - tinyurl.com/yz6aajf4
Try Your luck and win a FREE $500 or $1000 coupon! - tinyurl.com/yhxaqmng
Hi baby!! my name is Virginia...
I love oral sex! Write me - is.gd/be2piI
Try Your luck and win a Free Coca-Cola Pack! - tinyurl.com/y58phmar
WiFiBooster Pro provides you max speed with 300Mbps, no delay for playing game, online transfer files and video chat! Works with Any Router and Device (Smartphone, Computer, Smart tv, etc). Get 50% Off Today! Order Here - is.gd/OdxGOK
Fill out the form and win a Free $500 or $1000 voucher! - tinyurl.com/yf9odcpg
7
Oct 18, 2021 @ 4:16 pm
hey dear!!! my name is Sophia...
I want sex! Here are my photos - is.gd/kZlpA3
8
Oct 27, 2021 @ 4:16 pm
Hi !! my name Emily...
Do you want to see a beautiful female body? Here are my erotic photos - tinyurl.com/yzet8jvr
9
Nov 6, 2021 @ 2:14 pm
heey .. my name Rebecca!!!
I love oral sex! Write me - tinyurl.com/ydnrouzb
10
Dec 3, 2021 @ 7:19 pm
Hi !! my name Maria.
I love sex. Here are my erotic photos - is.gd/eP3qxP
11
Dec 20, 2021 @ 5:05 am
Hi .. Im looking a man!!!
If you want to meet me, I'm here - is.gd/5kUUii
12
Jan 13, 2022 @ 4:16 pm
heey baby!!! my name Margaret..
I want sex! Write me - chilp.it/bf4d037
13
Rapinia
Feb 5, 2022 @ 12:12 pm
Hi...?! I'm my name is Name.FirstName and I have
A
Good opportunity for Target.Name, just follow this link to learn Remote Zoom Hypnosys ::) (Many eyes for better hypnosys)
14
Rodawg Thepuss
Feb 5, 2022 @ 12:12 pm
Hi, my name is Rodawg Thepuss,Third of the name.
I am here to present you a new and exciting opportunity to take advantage of others with Hypnosis through TeamsMEET.Hypnosis Hypnosis Hypnosis Hypnosis Hypnosis Hypnosis Hypnosis .

This is a record access board which can hold 30 seconds information about all the Hypnosis teams in Singapore. These teams have made numerous activities in the whole of Singapore, which has led to many mass hypnosiemicy readings.

This is the fastest way you can fast way of getting your classmates' goal on term project , S P MOAR!

so join Hypnosis Team in TeamMeets.net to become team's master key. On my life I swear by the many success stories i have shared above.

To be free of all problems, if you will join my Virtual Talk seminar. No one could ever stop you from achieving success. Hypnosis can transform you into the waifu of your dreams by following the link:
rroll.to/wxjWSC
15
Luc
Apr 12, 2022 @ 11:11 am
Hello Folks,

For old Linux distributions I could suggest this web site - linux-distros.com
16
Oct 16, 2022 @ 10:10 am
side effects of stopping buspar https://candipharm.com/search?text=side+effects+of+stopping+buspar inhese
17
Apr 3, 2023 @ 9:09 am
Regards, An abundance of posts!
funny college essay https://dissertationwritingtops.com newsletter writing service https://essaywritingservicebbc.com
18
Apr 4, 2023 @ 2:02 am
You actually explained that well.
master thesis writer https://essaywritinghelperonline.com custom thesis writing service https://essaywritingservicebbc.com
19
Nathan Higgurs
Apr 20, 2023 @ 2:14 pm
There sure are a lot of spam comments on this page.
20
Sep 29, 2023 @ 3:03 am
hallo dear... Im looking a man.
I want sex! Write me - is.gd/vHiBd4
21
Reader
Oct 1, 2023 @ 4:04 am
Thanks for the command name lore.
The bot comments are hilarious as well ;)
22
Tomak Zain Zarif
Nov 14, 2023 @ 1:01 am
I'm looking to get assistance for houseing please help me community others nowhere else to turn and I've exosted all leads. I'm diabetic,with narapathy in my feet and hands.I'm a strong black man 46 years of age just had birthday Nov.3/which makes me a humbled Scorpio until you piss me off#1im a born and raises decent of Los Angle Cali. If you want to call or email me hit me up #1 @ tomakzarif65@gmail.com. I defianately need a woman in my life. Hit me soon#1

Comment about this article, ask questions, or add new information about this topic:




Top Document: Unix - Frequently Asked Questions (6/7) [Frequent posting]
Previous Document: A very brief look at Unix history.
Next Document: Main Players and Unix Standards.

Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Single Page

[ Usenet FAQs | Web FAQs | Documents | RFC Index ]

Send corrections/additions to the FAQ Maintainer:
tmatimar@isgtec.com (Ted Timar)





Last Update March 27 2014 @ 02:12 PM