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- From: steve@fywss.com (Steve Kotsopoulos)
- Newsgroups: comp.os.plan9,comp.os.misc,comp.answers,news.answers
- Subject: Plan 9 from Bell Labs - Frequently Asked Questions [FAQ]
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- Organization: FYWSS
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- Summary: FAQ for the Plan 9 operating system
- Date: Wed, 9 Apr 2003 16:21:58 +0000 (UTC)
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- Archive-name: comp-os/plan9-faq
- Last-modified: Mar 17, 2003
- Posting-Frequency: monthly
- URL: http://www.fywss.com/plan9/plan9faq.html
-
- This document answers frequently asked questions about the fourth edition of
- the Plan 9 operating system.
-
- The following sections are new or modified recently:
-
- * Where can I get the stable and current branches of Plan 9?
- * How do I take a screenshot?
- * What is the Plan 9 equivalent of the Unix find command?
- * Where did the names for Plan 9 applications come from?
-
- A hypertext version of this FAQ is available on my Plan 9 web page, URL
- http://www.fywss.com/plan9/
-
- Other sources of information include the newsgroup comp.os.plan9, which is
- bidirectionally gatewayed to the 9fans mailing list (browse archives at
- https://lists.cse.psu.edu/archives/9fans/ and
- http://bio.cse.psu.edu/~schwartz/9fans/, or mail 9fans-request@cse.psu.edu
- to subscribe) and of course the Plan 9 homepage at Bell Labs, URL
- http://plan9.bell-labs.com/plan9dist/ and the Plan 9 wiki at
- http://plan9.bell-labs.com/wiki/plan9/plan_9_wiki/index.html
-
- If you'd like to discuss the Plan9 license, send mail to
- plan9-license-discussions@plan9.bell-labs.com. Mailing to this list
- subscribes you to the list.
-
- Please forward any comments or suggestions regarding this FAQ to
- steve@fywss.com
- ------------------------------------------------------------------------
-
- Introduction:
-
- * What is Plan 9?
- * What is in the latest Plan9 release?
- * What is its relation to other operating systems?
- * What are its key ideas?
- * What are the advantages to this approach?
-
- Hardware and Software:
-
- * What platforms does it run on?
- * Is anyone working on a port for my system?
- * Does it support symmetric multiprocessing?
- * What about applications and tools?
- * Is there a fortran compiler?
- * Where can I get more Plan 9 software?
- * Is it object-oriented?
- * What about application portability?
- * What resources does it need?
- * What GUIs does it support?
- * How do I cut and paste with a 2 button mouse?
- * Does Plan 9 have any Unix-like terminal emulators?
- * What character set does it use?
- * What about security and user authentication?
- * How does it communicate with other systems?
- * Is it suitable for real time control?
-
- Installation and Administration:
-
- * What PC hardware works well with Plan 9?
- * How do I Install Plan 9?
- * Where can I get the stable and current branches of Plan 9?
- * It doesn't work for me, how should I troubleshoot?
- * How do I setup the VGA?
- * How do I take a screenshot?
- * What is the Plan 9 equivalent of the Unix find command?
- * How do I control the services that start at boot time?
- * How do I setup network services?
- * How do I shutdown my terminal/cpuserver system?
- * How do I reboot my system?
-
- General Information:
-
- * Where did the name come from?
- * Where did the names for Plan 9 applications come from?
- * How can I Obtain Plan 9?
- * How can I get involved?
- * Where can I get more detailed technical information?
- * Can I emulate Plan 9 under Unix?
- * Is the cross product of two vectors a vector?
- * Are there any Plan 9 user groups?
-
- ------------------------------------------------------------------------
-
- Introduction:
-
- Subject: What is Plan 9?
-
- Plan 9 is a new computer operating system and associated utilities. It was
- built by the Computing Science Research Center of Lucent Technologies Bell
- Laboratories, the same group that developed Unix, C, and C++.
-
- Plan 9 is a distributed system. In the most general configuration, it uses
- three kinds of components: terminals that sit on users' desks, file servers
- that store permanent data, and other servers that provide faster CPUs, user
- authentication, and network gateways. These components are connected by
- various kinds of networks, including Ethernet, specially-built fiber
- networks, ordinary modem connections, and ISDN. In typical use, users
- interact with applications that run either on their terminals or on CPU
- servers, and the applications get their data from the file servers. The
- design, however, is highly configurable; it escapes from specific models of
- networked workstations and central machine service.
-
- Subject: What is in the latest Plan9 release?
-
- The fourth release of Plan 9 provides a major overhaul of the system at
- every level. From the underlying file system protocol, 9P, through the
- kernel, libraries, and applications, almost everything has been modified
- and, in many cases, redesigned or rewritten.
-
- For more details, see the release notes at
- http://plan9.bell-labs.com/sys/doc/release4.html
-
- The new release is available for free download under an open source
- agreement.
-
- Subject: For History Buffs
-
- The first edition of Plan 9 was released in 1993, and was only available to
- universities.
-
- In 1995 the second edition was available for purchase under a shrink-wrap
- license.
-
- On June 7, 2000, the third release was made available for free download
- under an open source agreement. This was a significant step over previous
- releases.
-
- The third edition version of this FAQ is archived at
- http://www.fywss.com/plan9/plan9v3faq.html
-
- Subject: What is its relation to other operating systems?
-
- Plan 9 is itself an operating system; it doesn't run as an application under
- another system. It was written from the ground up and doesn't include other
- people's code. Although the OS's interface to applications is strongly
- influenced by the approach of Unix, it's not a replacement for Unix; it is a
- new design.
-
- Subject: What are its key ideas?
-
- Plan 9 exploits, as far as possible, three basic technical ideas: first, all
- the system objects present themselves as named files that are manipulated by
- read/write operations; second, all these files may exist either locally or
- remotely, and respond to a standard protocol; third, the file system name
- space - the set of objects visible to a program - is dynamically and
- individually adjustable for each of the programs running on a particular
- machine. The first two of these ideas were foreshadowed in Unix and to a
- lesser extent in other systems, while the third is new: it allows a new
- engineering solution to the problems of distributed computing and graphics.
- Plan 9's approach means that application programs don't need to know where
- they are running; where, and on what kind of machine, to run a Plan 9
- program is an economic decision that doesn't affect the construction of the
- application itself.
-
- Subject: What are the advantages to this approach?
-
- Plan 9's approach improves generality and modularity of application design
- by encouraging servers that make any kind of information appear to users and
- to applications just like collections of ordinary files. Here are a few
- examples.
-
- The Plan 9 window system (called rio) is small and clean in part because its
- design is centered on providing a virtual keyboard, mouse, and screen to
- each of the applications running under it, while using the real keyboard,
- mouse, and screen supplied by the operating system. That is - besides
- creating, deleting, and arranging the windows themselves - its job is be a
- server for certain resources used by its clients. As a side benefit, this
- approach means that the window system can run recursively in one of its
- windows, or even on another machine.
-
- Plan 9 users do Internet FTP by starting a local program that makes all the
- files on any FTP server (anywhere on the Internet) appear to be local files.
- Plan 9 PC users with a DOS/Windows partition on their disk can use the files
- stored there. ISO 9660 CD-ROMs and tar and cpio tapes all behave as if they
- were native file systems. The complete I/O behavior and performance of any
- application can be monitored by running it under a server that sees all its
- interactions. The debugger can examine a program on another machine even if
- it is running on a different hardware architecture.
-
- Another example is the approach to networks. In Plan 9, each network
- presents itself as a set of files for connection creation, I/O, and control.
- A common semantic core for the operations is agreed upon, together with a
- general server for translating human-readable addresses to network-specific
- ones. As a result, applications don't care which kind of network (TCP/IP,
- ISDN, modem) they are using. In fact, applications don't even know whether
- the network they are using is physically attached to the machine the
- application is running on: the network interface files can be imported from
- another machine.
-
- Hardware and Software:
-
- Subject: What platforms does it run on?
-
- The Plan 9 kernel and applications are highly portable. Plan 9 runs on four
- major machine architectures: Intel 386/486/Pentium, MIPS, Alpha, and
- PowerPC. Data structures and protocols are designed for distributed
- computing on machines of diverse design. Except for necessarily
- machine-dependent parts of the kernel, the compilers, and a few libraries,
- there is a single source representation for everything.
-
- To find out whether Plan 9 supports your hardware, read The Various Ports
- and Supported PC Hardware.
-
- Subject: Is anyone working on a port for my system?
-
- Perhaps ... let us know.
-
- Subject: Does it support symmetric multiprocessing?
-
- Yes. The SGI Challenge series of multiprocessors and multi processor
- Pentiums are supported. Be warned that Intel-based SMP systems are
- notoriously fickle in conforming to the Multiprocessor Specification and
- often some head-scratching is required when things don't just work.
-
- The system has been run on machines ranging from dual Pentium 90's up to
- quad Xeon 400's and the 8 processor Pentium Pro Axil system. By default, as
- it comes out the box, the release has SMP operation disabled by an option in
- the plan9.ini config file.
-
- Subject: What about applications and tools?
-
- Plan 9 comes with its own compilers for C and other languages, together with
- all the commands and program-development tools originally pioneered in the
- Unix environment. It also provides newly designed software. Acid is a
- programmable debugger that understands multiple-process programs, and the
- programs it is debugging may be running on a hardware platform different
- from its own. Acme is a new user interface in which any word on the screen
- can be interpreted as a command by clicking on it, and any string can
- specify a file to be displayed.
-
- Subject: Is there a fortran compiler?
-
- No, plan9 does not have a fortran compiler. If you have fortran programs you
- want to run, you can try using the f2c (fortran to C) converter available at
- ftp://netlib.bell-labs.com/netlib/f2c/
-
- Subject: Where can I get more Plan 9 software?
-
- Charles Forsyth has the original and still the largest list of software
- http://www.caldo.demon.co.uk/plan9/soft/index.html
- Russ Cox has cd players, mp3 player and a wide variety of other small
- tools
- http://www.eecs.harvard.edu/~rsc/plan9.html
- Tad Hunt can help you balance your bank account, boot your laptop and
- listen to music
- http://csh-east.org/~tad/plan9/
- Nemo (Francisco Ballesteros) has a collection of drivers and utilities
- http://plan9.escet.urjc.es/usr/nemo/9.html
- Kenji Arisawa's ftp site
- ftp://plan9.aichi-u.ac.jp/
- Boyd Roberts writes rc scripts when not ranting on 9fans
- http://home.fr.inter.net/boyd/code/repo/
- There's a native Python port at
- http://home.fr.inter.net/boyd/code/plan9/pythonR3.tgz [based on
- Russ' port to 9P2000]
-
- Subject: Is it object-oriented?
-
- No, not in the conventional sense. It is written in a strict dialect of
- ISO/ANSI C. In a wider sense, its general design of making all its `objects'
- look like files to which one talks in a well-defined protocol shows a
- related approach.
-
- Subject: What about application portability?
-
- Plan 9 comes with a library that makes it easy to import POSIX-conforming
- applications. There is also a library that emulates the Berkeley socket
- interface.
-
- Subject: What resources does it need?
-
- As might be expected, the answer depends on what you want to do. The kernel,
- the window system, and the basic applications will run comfortably on a PC
- with 8MB of memory.
-
- On the other hand, the system can grow. The installation at Bell
- Laboratories includes multiprocessor SGI Challenge and Pentium machines as
- CPU servers, and a 350GB Sony WORM disk jukebox for the file server.
-
- Subject: What GUIs does it support?
-
- The standard interface doesn't use icons or drag-n-drop; Plan 9 people tend
- to be text-oriented. But the window system, the editor, and the general feel
- are very mousy, very point-and-click: Plan 9 windows are much more than a
- bunch of glass TTYs. The system supports the graphics primitives and
- libraries of basic software for building GUIs.
- A screenshot is available at
- http://plan9.bell-labs.com/plan9dist/screenshot.html
-
- Subject: How do I cut and paste with a 2 button mouse?
-
- Plan 9 really works well only with a three-button mouse. In the meantime,
- Shift-Right-button will simulate a middle button, but that is inadequate for
- Acme's chording.
-
- Subject: Does Plan 9 have any Unix-like terminal emulators?
-
- The Plan 9 window system doesn't obey any inline cursor controls, since none
- of the native applications use cursor-addressing. All cursor control in rio,
- acme and sam is via the mouse.
-
- To see some excellent articles on this important and divisive user interface
- issue read http://www.asktog.com/readerMail/1999-12ReaderMail.html.
-
- If you want to get from Plan9 to Unix systems, you can run /bin/vt in one of
- your windows, telnet/rlogin to Unix, and set the term/TERM variable
- accordingly on the Unix end. See vt(1) for more details; note that vt(1) can
- emulate a VT100 VT220 or ANSI terminal.
-
- Subject: What character set does it use?
-
- The character set is Unicode, the 16-bit set unified with the ISO 10646
- standard for representing languages used throughout the world. The system
- and its utilities support Unicode using a byte-stream representation (called
- UTF-8) that is compatible with ASCII. On Plan 9, one may grep for Cyrillic
- strings in a file with a Japanese name and see the results appear correctly
- on the terminal.
-
- Subject: What about security and user authentication?
-
- Plan 9's authentication design is akin to that of MIT's Kerberos. Passwords
- are never sent over networks; instead encrypted tickets are obtained from an
- authentication server. It doesn't have the concept of `set UID' programs.
- The file server doesn't run user programs, and except at its own console, it
- doesn't allow access to protected files except by authenticated owners. The
- concept of a special `root' user is gone.
-
- Subject: How does it communicate with other systems?
-
- The distribution includes a u9fs server that runs on Unix-compatible systems
- and understands the native Plan 9 remote file protocol, so that file systems
- of Unix machines may be imported into Plan 9. It also includes an
- NFS-compatible server that runs on Plan 9, so that Plan 9 file systems may
- be accessed from other systems that support NFS. It includes the full suite
- of Internet protocols (telnet, rlogin, ftp).
-
- Subject: Is it suitable for real time control?
-
- No, it is not. It is a general purpose system, without an interrupt priority
- scheme or real scheduler.
-
- Installation and Administration:
-
- Subject: What PC hardware works well with Plan 9?
-
- If you don't want to spend time fiddling with and swapping PC hardware, you
- may prefer to buy hardware that is in use within Bell Labs, see Supported PC
- Hardware.
-
- The biggest source of problems is getting the VGA configured on PC
- terminals. For best performance and functionality, it is recommended that
- you use a card that can run at 16 bits per pixel or greater, and with
- hardware-accelerated graphics support; currently only the Mach64 and S3
- Virge are supported to this extent. The best buy today seems to be the ATI
- 8Meg Xpert 98 cards.
-
- For a cpuserver or fileserver any old card that can do CGA is fine.
-
- Subject: How do I Install Plan 9?
-
- The installation is designed to be run from a PC.
- 1. Read "Supported PC hardware" to ensure your PC meets the requirements.
- 2. Back up your system.
- 3. Make sure you've backed up your system.
- 4. Read "Installing the Plan 9 Distribution" at URL
- http://plan9.bell-labs.com/wiki/plan9/Installation_instructions/index.html
- 5. See the Staying up to Date page for information on how to obtain the
- latest fixes.
- 6. Here are some more questions that have been answered on the 9fans list:
- IP configuration
- ndb/cs will set the sysname if you setup an appropriate entry in
- /lib/ndb/local. You must specify an 'ether=' entry, and the
- address should be all lower case. If all goes well, ip/ipconfig
- will then configure IP.
- Name Service
- If you have having problems, first check that ndb/dns is running.
- It needs to be started in /rc/bin/termrc or /rc/bin/cpurc. Also
- note that only fully qualified names are supported, and there
- isn't a separate resolver.
- Binding and Mounting Devices
- Note that # is the shell comment character, so you must enclose it
- in single quotes. For example: bind -a '#R6' /dev
- Auth Server
- When booting a cpuserver without an auth server, if you give
- 0.1.0.0 as the auth server address instead the cpu server's own
- address, you won't have to wait for it to timeout.
-
- Subject: Where can I get the stable and current branches of Plan 9?
-
- The stable releases are the ones in the CD images from the updates page.
- If you pull often from replica, you get the equivalent of 'the current
- brach'.
-
- Subject: It doesn't work for me, how should I troubleshoot?
-
- If you are having having SCSI problems, check your cables and terminators.
- this is generally the single largest cause of weird SCSI problems. Active
- terminators are best. If you run external cables you need to get high
- quality ones. Also, don't crank of the speed on the card.
-
- Subject: How do I setup the VGA?
-
- If the VGA doesn't work, read the last couple sections (Setting Up and
- Troubleshooting) of "Installing the Plan 9 Distribution"
-
- You will have to find out more about the card so you can configure it. The
- relevant manuals are: vga(3), vgadb(6), vga(8), and 9load(8).
-
- If your VGA card is not supported, you could try
- http://mapage.noos.fr/philippe.anel/ for Matrox G200 G400 and G450 drivers
- by Philippe Anel
-
- Put
- debug=1
- (1st line) in plan9.ini and try again. It may not be of much help but will
- allow to ask a more specific question.
-
- Subject: How do I take a screenshot?
-
- It's simple, use utilities such as togif, topng, toppm for example:
- togif < /dev/screen > screenshot.gif
-
- Subject: What is the Plan 9 equivalent of the Unix find command?
-
- The simplest equivalent is:
- du -a . | grep foo
- A useful variation is:
- grep foo `{du -a . | awk '{print $2}'
-
- Subject: How do I control the services that start at boot time?
-
- This is controlled by shell scripts, that are roughly equivalent to the
- /etc/rc files on Unix:
- /rc/bin/termrc for terminals
- /rc/bin/cpurc for cpu servers
-
- See cpurc(8) for more details.
-
- Subject: How do I setup network services?
-
- For UDP services, you must start them up in the appropriate cpurc(8) file.
- For TCP or IL services, you must use the listen(8) daemon.
-
- Subject: How do I shutdown my terminal/cpuserver system?
-
- If you booted from a real fileserver, you can just turn it off.
-
- If you are using kfs, you must halt the disks manually by typing
- disk/kfscmd halt
- at a prompt and waiting for ``kfs: file system halted'' to appear on the
- screen.
-
- Not doing this means the disk might not be in a consistent state or modified
- data might not have been written out yet; not halting the disk forces the
- long wait at the ``kfs...'' when you boot the next time while kfs checks the
- disk.
-
- Subject: How do I reboot my system?
-
- The system can be rebooted by typing ^T^Tr (two control-T's followed by
- 'r'). Cpu servers can be rebooted by typing ^P on the console. See the
- cons(3) manual for more details.
-
- General Information:
-
- Subject: Where did the name come from?
-
- It was chosen in the Bell Labs tradition of selecting names that make
- marketeers wince. The developers also wished to pay homage to the famous
- film, "Plan 9 From Outer Space".
-
- Subject: Where did the names for Plan 9 applications come from?
-
- The name of default user glenda was chosen from Ed Wood's film "Glen or
- Glenda".
- The original Unix editor was called ed, so Rob Pike called his first screen
- editor jim, and the next one sam. Sam is actually short for Samantha.
- 8 1/2 is called that as it was Pike's 8 and a halfth windowing system - it
- also happens to be a film by Fellini.
- Alef (concurrent language) is named analagously to B and C, just choosing
- from a new alphabet.
- Acme is probably named after Wile E. Coyote's equipment supplier.
- The Plan 9 shell is called "rc", because it ``runs commands''.
- Mothra (Plan 9 web-browser in second release) is named after the Japanese
- horror-movie monster. Tom Duff picked the name because Netscape's browser is
- called Mozilla (a portmanteau of Mosaic (its progenitor) and Godzilla) and
- mothra is its Plan 9 `competition.'
-
- The hermeneutics of naming yields few insights. Things are named usually
- because the name is nice (sam), or there is some private reference hard to
- decode (8 1/2), or in honour (perhaps backhanded) of another system
- (mothra), or an indication of expectation (Plan 9, Acme), or just because
- (acid). None of the names tell you anything helpful.
-
- Despite the lack of information, those who guess at reasons for naming
- generate volumes of apocrypha. The real reason is usually, "because".
-
- Subject: How can I Obtain Plan 9?
-
- The Plan 9 release is available for free download at
- http://plan9.bell-labs.com/plan9dist/download.html
- It includes source of the kernel, libraries, and commands for all supported
- architectures. It also includes complete binaries for the x86 architecture.
-
- Subject: How can I get involved?
-
- The best way to learn about the system is to write something that other
- people in the Plan 9 user community could use, or to port the system to new
- platforms.
-
- Subject: Where can I get more detailed technical information?
-
- The Bell Labs site plan9.bell-labs.com stores a wealth of information about
- the system.
- The manual pages are at http://plan9.bell-labs.com/sys/man/
- For auxiliary documentation, see http://plan9.bell-labs.com/sys/doc/
- A Plan 9 wiki is maintained by enthusiasts at
- http://plan9.bell-labs.com/wiki/plan9/plan_9_wiki/index.html
-
- Subject: Are there any Plan 9 user groups?
-
- There is one in Austin, Texas. See
- http://einstein.ssz.com/hangar18/index.html It's open to anyone, even if you
- don't live in Austin.
-
- Subject: Is the cross product of two vectors a vector?
-
- No, it is not, and the fact that people treat it as one is the problem. The
- *geometric object* that is the closest thing to the c.p. is a skew tensor
- (practically the same as wedge product), which (only) in 3D has Cartesian
- components that resemble those of a vector, *except* that this pseudo-vector
- *flips* under reflection (unlike a genuine vector). Unfortunately,
- physicists have been trained to express Maxwell's laws as a relationship
- between a genuine vector (field) and a c.p., which means that that
- expression of those laws *changes* under reflection, something that
- physicists are *not* taught and which appears to have been overlooked in the
- analysis of the (nonconservation of) parity experiment.
- I had to quote Douglas Gwyn verbatim on this, because I have no *ucking clue
- what he's talking about -- Steve
-
- Subject: Can I emulate Plan 9 under Unix?
-
- Ron Minnich has implemented private name spaces for Linux and FreeBSD. You
- can get documentation and source code from
- http://www.acl.lanl.gov/~rminnich/
-
- Several Plan 9 inspired applications are available for Unix systems.
-
- The sam editor is available from
- ftp://netlib.bell-labs.com/netlib/research/sam.shar.gz
-
- There is also a Windows 95/NT version of Sam, currently distributed in
- binary form only, available from
- ftp://netlib.bell-labs.com/netlib/research/sam.exe Comments and bug reports
- can be sent to seanq@research.bell-labs.com
-
- Wily is an acme lookalike by Gary Capell. See
- http://www.cs.yorku.ca/~oz/wily/
-
- Mark H. Wilkinson's 9libs package of Plan 9 emulation libraries for Unix is
- probably the easiest-to-install distribution of sam and wily. You can get it
- from http://www.netlib.org/research/9libs/
-
- A free re-implementation of the rc shell is available from
- http://www.star.le.ac.uk/~tjg/rc/
-
- 9wm is David Hogan's lightweight X window manager in the style of 8╜/rio. It
- was once available from ftp://ftp.cs.su.oz.au/dhog/9wm/ but is being moved
- to a new home. Comments to dhog@plan9.bell-labs.com
-
- 9term is an 8╜ terminal emulator by Matty Farrow, matty@cs.su.oz.au,
- available from ftp://ftp.cs.su.oz.au/matty/unicode/ In the same directory,
- you'll find a collection of Unicode fonts that can be used with 9term, sam
- and wily.
-
- 9menu is a simple program by Arnold Robbins, arnold@skeeve.com, that allows
- you to create X menus from the shell, where each menu item will run a
- command. 9menu is intended for use with 9wm, but can be used with any other
- window manager. It is available from
- ftp://ftp.freefriends.org/arnold/Source/9menu-1.5.shar.gz
-
- Copyright ⌐ 1995 Lucent Technologies. All rights reserved.
- --
- Steve Kotsopoulos steve@fywss.com
-