namespace – structure of conventional file name space


After a user's profile has run, the file name space should adhere to a number of conventions if the system is to behave normally. This manual page documents those conventions by traversing the file hierarchy and describing the points of interest. It also serves as a guide to where things reside in the file system proper. The traversal is far from exhaustive.

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/timezoneDirectory of timezone files; see ctime(2).
Time zone description for Eastern Time. Other such files are in this directory too.
Time zone description for the local time zone; a copy of one of the other files in this directory.
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.
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.
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.
Startup code for rc(1).
/lib          Collections of data, generally not parts of programs.
etc.           Databases.
/lib/ndb       The network database used by the networking software; see ndb(6) and ndb(8).
The file used by newns (see auth(2)) to establish the default name space; see namespace(6).
/lib/font/bitBitmap font files.
Vector font files.
/lib/rfc       Directory of Internet `Requests For Comments', ranging from trivia to specifications.
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/acidDirectory of acid(1) load modules.
/sys/lib/distSoftware used to assemble the distribution's installation floppy.
Directory of troff(1) font tables and macros.
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/systemSystem–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)).
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/factotumMount 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.

intro(1), namespace(6)
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