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hier(5)
NAME
  hier - Layout of file systems

DESCRIPTION
  This page describes the file system hierarchy.  As a general rule, it lists
  only directories.

  /   The root directory of the file system

  /dev/
      Block and character device files

  /etc/
      System configuration files and databases.	 These are nonexecutable
      files.

      nls/
	  National Language Support databases

  /lost+found/
      Files located by fsck

  /opt/
      Optional application packages

  /sbin/
      Commands essential for the system to boot.  These commands do not
      depend on shared libraries or the loader and can have other versions in
      /usr/bin or /usr/sbin.

      init.d/
	  System state rc files

      rc0.d/
	  rc files executed for system-state 0

      rc2.d/
	  rc files executed for system-state 2

      rc3.d/
	  rc files executed for system-state 3

  /stand/
      Standalone programs

  /tmp/
      System generated temporary files (the contents of /tmp are usually not
      preserved across a system reboot)

  /usr/
      Contains the majority of user utilities and applications

      bin/
	  Common utilities and applications

      ccs/
	  C compilation system; tools and libraries used to generate C
	  programs

	  bin/
	      Development binaries (includes cc, ld, make, etc.)

	  lib/
	      Development libraries and backends

      include/
	  Program header (include) files; not all subdirectories are listed
	  below

	  mach/	  Mach specific C include files

	  machine/
		  Machine specific C include files

	  net/	  Miscellaneous network C include files

	  netimp/ C include files for IMP protocols

	  netinet/
		  C include files for Internet standard protocols

	  netns/  C include files for XNS standard protocols

	  nfs/	  C include files for Network File System (NFS)

	  protocols/
		  C include files for Berkeley service protocols

	  rpc/	  C include files for remote procedure calls

	  servers/
		  C include files for servers

	  streams/
		  C include files for Streams

	  sys/	  System C include files (kernel data structures)

	  tli/	  C include files for Transport Layer Interface

	  ufs/	  C include files for UFS

      lbin/
	  Back-end executables

	  spell/
	      Spell back-end

      lib/
	  Consists of links to libraries located elsewhere (/usr/ccs/lib,
	  /usr/lbin, /usr/share/lib, /X11/lib), and includes

	  uucp/
	      UUCP programs

      sbin/
	  System administration utilities and system utilities

      share/
	  Architecture-independent ASCII text files

	  dict/
	      Word lists

	  lib/

	      me/     Macros for use with the ME macro package

	      ms/     Macros for use with the MS macro package

	      tabset/ Tab description files for a variety of terminals; used
		      in /etc/termcap

	      terminfo/
		      Terminal information database

	      tmac/   Text processing macros

	  man/
	      Online reference pages:

	      man1/
		  Source for user command reference pages

	      man2/
		  Source for system call reference pages

	      man3/
		  Source for library routine reference pages

	      man4/
		  Source for file format reference pages

	      man5/
		  Source for miscellaneous reference pages

	      man7/
		  Source for device reference pages

	      man8/
		  Source for administrator command reference pages

	      cat1-8
		  Formatted versions of reference pages in the man1 through
		  man8 directories

      shlib/
	  Binary loadable shared libraries; shared versions of libraries in
	  /usr/ccs/lib

  /var/
      Multipurpose log, temporary, transient, varying, and spool files,
      including:

      adm/
	  Common administrative files and databases

	  crash/  For saving kernel crash dumps

	  cron/	  Files used by cron

	  sendmail/
		  sendmail configuration and database files

	  syslog/ Files generated by syslog

      spool/
	  Miscellaneous printer and mail system spooling directories,
	  including:

	  lpd/
	      Line printer spooling directories

	  mail/
	      Incoming mail messages

	  mqueue/
	      Undelivered mail queue

	  uucp/
	      UUCP spool directory

      tmp/
	  Application-generated temporary files that are kept between system
	  reboots

      run/
	  Files created when daemons are running

  /vmunix
      Pure kernel executable (the operating system loaded into memory at boot
      time)

SEE ALSO
  Commands: ls(1), apropos(1), whatis(1), whereis(1), finger(1), which(1),
  find(1), grep(1), fsck(8)