Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (OSF1-V5.1-alpha)
Apropos / Subsearch:
optional field

df(1)									df(1)


  df - Displays	statistics on free disk	space


  [Tru64 UNIX]	The default behavior for the df	command	is BSD SVR4 compli-
  ant.	In this	case, the df command uses the following	syntax:

  df [-eiknP] [-t fstype] [file	| file_system...]

  To cause the df command to exhibit XCU5.0 behavior, set the CMD_ENV
  environment variable to xpg4.	 In this case, the df command uses the fol-
  lowing syntax:

  df [-eiknPt] [-F fstype] [file | file_system...]


       The CMD_ENV environment variable	also affects the behavior of the echo
       command.	 The BIN_SH environment	variable affects the XPG4 compliance
       of the Bourne shell.

  The df command displays statistics on	the amount of free disk	space on
  file_system or on the	file system that contains the specified	file.


  Interfaces documented	on this	reference page conform to industry standards
  as follows:

  df: XCU5.0

  Refer	to the standards(5) reference page for more information	about indus-
  try standards	and associated tags.


  -e  Displays information about the mounted file systems, including the
      automount	intercept point.

  -F [no] fstype
      [Tru64 UNIX]  Displays statistics	for the	specified file system type
      only.  If	the no prefix is used, all file	systems, except	the one
      specified, are displayed.	See the	-t option description for a list of
      available	file system types.

  -i  [Tru64 UNIX]  Reports the	number of free and used	inodes.	 The number
      of inodes	controls the number of files that can exist in a file system.

  -k  Causes the numbers to be reported	in kilobytes.  By default, all
      reported BSD compatible numbers are in 512-byte blocks.

  -n  [Tru64 UNIX]  Displays the previously obtained statistics	from all
      mounted file systems.  Use this option if	it is possible that one	or
      more file	systems	are in a state such that they will not be able to
      provide statistics without a long	delay (for example, if you have	a
      remote file system on a server that has crashed).	 If you	specify	the
      -n option, the df	command	does not request new statistics	from the file
      systems; for some	remote file systems, the statistics displayed may be
      too obsolete to be useful.

  -P  Produces output that consists of one line	of information for each
      specified	file system, with reported numbers in 512-byte blocks

  -t  Includes total allocated space figures in	the output (default).

  -t [no] fstype
      [Tru64 UNIX]  (SVR4 environment only) Displays statistics	for only the
      specified	file system type.  If the no prefix is used, all file sys-
      tems, except the one specified, are displayed. Available file system
      types include the	following:

      ufs [Tru64 UNIX]	UNIX File System (Berkeley fast	file system) or	a
	  swap partition

      nfs [Tru64 UNIX]	Network	File System (NFS), Version 2 protocol

      mfs [Tru64 UNIX]	Memory File System (RAM	Disk) (See mfs(8))

	  [Tru64 UNIX]	PC File	System

	  [Tru64 UNIX]	System V File System

	  [Tru64 UNIX]	ISO 9660 or High Sierra	Formatted (CD-ROM) File	Sys-

      dfs [Tru64 UNIX]	DCE Distributed	File System

      efs [Tru64 UNIX]	DCE Episode File System

	  [Tru64 UNIX]	Process	File System (used by debuggers)

	  [Tru64 UNIX]	Advanced File System (AdvFS)

      ffm [Tru64 UNIX]	File on	File mount (used by streams)

	  [Tru64 UNIX]	File Descriptor	File System (used by streams)

	  [Tru64 UNIX]	Reserved for third-party file systems

	  [Tru64 UNIX]	Network	File System, Version 3 protocol


  file | file_system
      The name of a file, or file system, about	which information is soli-

      If no value is specified,	information is written on all mounted file


  [Tru64 UNIX]	To obtain XCU5.0 compliance, set the environment variable
  CMD_ENV to xpg4.  If the environment variable	is not set or it is set	to
  another value, the environment defaults to BSD SVR4.	If neither a file or
  a file system	is specified, statistics for all mounted file systems are

  [Tru64 UNIX]	When file system disk usage exceeds 100% of the	allowed	space
  for users, the df command displays a negative	number of free blocks. The
  allowed space	for users is typically 90% of disk capacity, with 10%
  reserved for use by root only	(this is not true for AdvFS, see below).
  Consequently as a result of this, the	disk usage is under reported by
  approximately	10%. However, system administrators may	specify	either less
  or more reserved space for use by root.

  System V Compatibility

  [Tru64 UNIX]	The root of the	directory tree that contains the commands
  modified for SVID 2 compliance is specified in the file /etc/svid2_path.
  You can use /etc/svid2_profile as the	basis for, or to include in, your
  .profile.  The file /etc/svid2_profile reads /etc/svid2_path and sets	the
  first	entries	in the PATH environment	variable so that the modified SVID 2
  commands are found first.

  [Tru64 UNIX]	The df command,	as modified for	SVID 2 compliance, accepts
  one command line option (-t, print space totals) and an optional file	sys-
  tem name or device name.  The	command	displays the mount point, the mounted
  device, the number of	free blocks (in	512-byte quantities), and the number
  of free inodes.  If the -t option is specified, the command displays,	on a
  separate line	following the free block counts, the total number of blocks
  and inodes for each mounted device.

  Advanced File	System

  [Tru64 UNIX]	For AdvFS file systems,	the df command displays	disk space
  usage	information for	each fileset. Because AdvFS uses a different design
  than UFS, the	df command reflects disk space usage somewhat differently
  than UFS.

  [Tru64 UNIX]	AdvFS uses a domain-fileset model rather than a	one-file
  system-per-volume model like traditional UNIX	file systems. A	fileset	can
  reside alone on a single-volume domain (a UFS	model),	alone on a multi-
  volume domain, or can	share a	single or multi-volume domain with other
  filesets.  A fileset can consume all space in	its domain or it may be	con-
  strained by fileset quotas.

  [Tru64 UNIX]	AdvFS allows quotas to be established for filesets. Fileset
  quotas limit the amount of space that	one fileset can	use.  For filesets
  that have quotas established,	the 512-blocks,	Avail, and Capacity values
  reflect limits imposed by quotas. They do not	represent actual space avail-
  able in the file domain unless there is less space in	the domain than
  allowed by the quota limit.  When both soft and hard limits are set, the
  lower	limit is used to calculate totals.

  [Tru64 UNIX]	The following is an explanation	of each	of the fields in the
  df command display for AdvFS file systems:

      [Tru64 UNIX]  The	complete fileset name.	The syntax is

      [Tru64 UNIX]  The	total amount of	space in the file domain in which the
      fileset resides, represented in either 512K blocks or 1024K blocks.
      Metadata,	which takes away space from the	domain and is not available
      for filesets to use, is included as reserved in this total. This total
      represents: used+free+reserved.

      [Tru64 UNIX]  When fileset quotas	are imposed, this field	represents
      the limit	set by the fileset quota.

      [Tru64 UNIX]  The	total amount of	space used by the fileset. When	run
      against an AdvFS fileset clone, the number reported for Used blocks is
      the number of blocks used	in the original	fileset	at the time the	clone
      fileset was created.

      [Tru64 UNIX]  The	total amount of	unused space in	the domain available
      to the fileset.  Because ALL unused space	in the file domain is avail-
      able to all of the filesets, this	value is the same for all filesets in
      a	domain,	unless fileset quotas are established.

      [Tru64 UNIX]  When fileset quotas	are established, this value reflects
      the amount of space remaining until the quota limit is reached. If
      there is less available space in the domain than allowed by the quota
      limit, the available domain space	is displayed.

      [Tru64 UNIX]  How	full the fileset is, represented as a percentage.
      This amount is calculated	as: used/(used+available). In domains with
      multiple filesets, the total capacity of all filesets in that domain
      can be greater than 100%.	 This is because the available space value
      used in the calculation is available to all of the filesets; each
      fileset capacity is calculated independently.

      [Tru64 UNIX]  Reports the	number of inodes in use	by normal files, sym-
      links, and all directories in the	fileset. When run against an AdvFS
      clone, Iused reports the number of inodes	in use by the original
      fileset at the time the clone fileset was	created.

      [Tru64 UNIX]  Reports the	total number of	inodes available for use in
      the fileset.

      [Tru64 UNIX]  Reports the	number of inodes in use	in the fileset,
      represented as a percentage. This	amount is calculated as:

  Mounted On
      [Tru64 UNIX]  The	mount point of the fileset.On a	TruCluster Server,
      showfsets	can sometimes report incorrect disk usage. Data	in CFS client
      caches is	synchronized to	the server at least every 30 seconds.
      Incorrect	disk usage is reported if stale	data exists in client caches
      when the showfsets executes.

      [Tru64 UNIX]  Note

      On a TruCluster Server, df can sometimes report incorrect	disk usage.
      Data in CFS client caches	is synchronized	to the server at least every
      30 seconds. The disk usage reported does not account for dirty data in
      client caches that has not yet been synchronized to the server.


  [Tru64 UNIX]	The df command supports	mount point pathnames of up to
  MNAMELEN, which includes the null terminating	character.


  The following	exit values are	returned:

  0   Successful completion.

  >>0  An error occurred.


  The following	environment variables affect the execution of df:

      [Tru64 UNIX]  This variable must be set to xpg4 to cause the df command
      to exhibit XCU5.0	behavior.

      Provides a default value for the internationalization variables that
      are unset	or null. If LANG is unset or null, the corresponding value
      from the default locale is used. If any of the internationalization
      variables	contain	an invalid setting, the	utility	behaves	as if none of
      the variables had	been defined.

      If set to	a non-empty string value, overrides the	values of all the
      other internationalization variables.

      Determines the locale for	the interpretation of sequences	of bytes of
      text data	as characters (for example, single-byte	as opposed to multi-
      byte characters in arguments).

      Determines the locale for	the format and contents	of diagnostic mes-
      sages written to standard	error.

      Determines the location of message catalogues for	the processing of


  Commands:  du(1), echo(1), find(1), ksh(1), mount(8),	quot(8), quota(1),
  Bourne shell sh(1b), POSIX shell sh(1p), showfdmn(8),	showfsets(8)

  Functions:  fstatfs(2), mount(2), statfs(2), statvfs(2)

  Routines:  getvfsbyname(3)

  Files:  fs(4), fstab(4)

  Standards:  standards(5)