First, here is the appearance of the file server as it appears before any mounts or bindings.

/

The root directory.

/adm

The administration directory for the file server.

/adm/users

List of users known to the file server; see users(6).

/adm/keys

Authentication keys for users.

/adm/netkeys

SecureNet keys for users; see securenet(8).

/adm/timezone

Directory of timezone files; see ctime(2).

/adm/timezone/EST.EDT

Time zone description for Eastern Time. Other such files are in this directory too.

/adm/timezone/timezone

Time zone description for the local time zone; a copy of one of the other files in this directory.

/bin

/dev

/env

/fd

/net

/proc

/srv

/tmp

All empty unwritable directories, place holders for mounted services and directories.

/mnt

A directory containing mount points for applications.

/n

A directory containing mount points for file trees imported from remote systems.

/386

/68000

/68020

/alpha

/arm

/mips

/power

/sparc

Each CPU architecture supported by Plan 9 has a directory in the root containing architecture-specific files, to be selected according to $objtype or $cputype (see 8c(1) and init(8)). Here we list only those for /386.

/386/init

The initialization program used during bootstrapping; see init(8).

/386/bin

Directory containing binaries for the Intel x86 architecture.

/386/bin/aux

/386/bin/ip

etc.

Subdirectories of /386/bin containing auxiliary tools and collecting related programs.

/386/lib

Directory of object code libraries as used by 8l (see 8l(1)).

/386/include

Directory of x86-specific C include files.

/386/9*

The files in /386 beginning with a 9 are binaries of the operating system or its bootstrap loader.

/386/mkfile

Selected by mk(1) when $objtype is 386, this file configures mk to compile for the Intel x86 architecture.

/rc

Isomorphic to the architecture-dependent directories, this holds executables and libraries for the shell, rc(1).

/rc/bin

Directory of shell executable files.

/rc/lib

Directory of shell libraries.

/rc/lib/rcmain

Startup code for rc(1).

/lib

Collections of data, generally not parts of programs.

/lib/mammals

/lib/sky

etc.

Databases.

/lib/ndb

The network database used by the networking software; see ndb(6) and ndb(8).

/lib/namespace

The file used by newns (see auth(2)) to establish the default name space; see namespace(6).

/lib/font/bit

Bitmap font files.

/lib/font/hershey

Vector font files.

/lib/rfc

Directory of Internet `Requests For Comments', ranging from trivia to specifications.

/lib/rfc/grabrfc

Maintains RFC collection; usually run from cron (see auth(8)).

/sys

System software.

/sys/include

Directory of machine-independent C include files.

/sys/lib

Pieces of programs not easily held in the various bins.

/sys/lib/acid

Directory of acid(1) load modules.

/sys/lib/dist

Software used to assemble the distribution's installation floppy.

/sys/lib/troff

Directory of troff(1) font tables and macros.

/sys/lib/yaccpar

The yacc(1) parser.

/sys/man

The manual.

/sys/doc

Other system documentation.

/sys/log

Log files created by various system services.

/sys/src

Top-level directory of system sources.

/sys/src/cmd

Source to the commands in the bin directories.

/sys/src/9

Source to the operating system for terminals and CPU servers.

/sys/src/fs

Source to the operating system for file servers.

/sys/src/lib*

Source to the libraries.

/usr

A directory containing home directories of users.

/mail

Directory of electronic mail; see mail(1).

/mail/box

Directory of users' mail box files.

/mail/lib

Directory of alias files, etc.

/acme

Directory of tools for acme(1).

/cron

Directory of files for cron(8).

/cfg/system

System-specific files, often addenda to their namesakes, notably cpurc, termrc, namespace, and consoledb.

The following files and directories are modified in the standard name space, as defined by /lib/namespace (see namespace(6)).

/

The root of the name space. It is a kernel device, root(3), serving a number of local mount points such as /bin and /dev as well as the bootstrap program /boot. Unioned with / is the root of the main file server.

/boot

Compiled into the operating system kernel, this file establishes the connection to the main file server and starts init; see boot(8) and init(8).

/bin

Mounted here is a union directory composed of /$objtype/bin, /rc/bin, $home/$objtype/bin, etc., so /bin is always the directory containing the appropriate executables for the current architecture.

/dev

Mounted here is a union directory containing I/O devices such as the console (cons(3)), the interface to the raster display (draw(3)), etc. The window system, rio(1), prefixes this directory with its own version, overriding many device files with its own, multiplexed simulations of them.

/env

Mounted here is the environment device, env(3), which holds environment variables such as $cputype.

/net

Mounted here is a union directory formed of all the network devices available.

/net/cs

The communications point for the connection server, ndb/cs (see ndb(8)).

/net/dns

The communications point for the Domain Name Server, ndb/dns (see ndb(8)).

/net/tcp

/net/udp

Directories holding the IP protocol devices (see ip(3)).

/proc

Mounted here is the process device, proc(3), which provides debugging access to active processes.

/fd

Mounted here is the dup device, dup(3), which holds pseudonyms for open file descriptors.

/srv

Mounted here is the service registry, srv(3), which holds connections to file servers.

/srv/boot

The communication channel to the main file server for the machine.

/mnt/factotum

Mount point for factotum(4).

/mnt/wsys

Mount point for the window system.

/mnt/term

Mount point for the terminal's name space as seen by the CPU server after a cpu(1) command.

/n/kremvax

A place where machine kremvax's name space may be mounted.

/tmp

Mounted here is each user's private tmp, $home/tmp.