df(1)							      General Commands Manual							     df(1)

NAME

       df - Displays statistics on free disk space

SYNOPSIS

       [Tru64  UNIX]  The  default  behavior for the df command is BSD SVR4 compliant.	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
       following syntax: df [-eiknPt] [-F fstype] [file | file_system...]

									  Note

       The  CMD_ENV  environment variable also affects the behavior of the echo command.  The BIN_SH environment variable affects the XPG4 compli-
       ance 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.

STANDARDS

       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 industry standards and associated tags.

OPTIONS

       Displays information about the mounted file systems, including the automount intercept point.  [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.  [Tru64 UNIX]  Reports the number of free inodes.  The number of inodes controls the
       number of files that can exist in a file system. Reports Iused for AdvFS clone filesets as the number of files in use by the original file-
       set at the time the clone fileset was created.  Causes the numbers to be reported in kilobytes.	By default, all  reported  BSD	compatible
       numbers	are in 512-byte blocks.  [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.
       Produces  output  that  consists  of  one  line	of  information  for  each specified file system, with reported numbers in 512-byte blocks
       (default).  Includes total allocated space figures in the output (default).  [Tru64 UNIX]  (SVR4 environment only) Displays statistics  for
       only  the  specified file system type.  If the no prefix is used, all file systems, except the one specified, are displayed. Available file
       system types include the following: [Tru64 UNIX]  UNIX File System (Berkeley fast file system) or a swap  partition  [Tru64  UNIX]  Network
       File  System  (NFS),  Version  2  protocol  [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 System [Tru64 UNIX]  DCE Distributed File  System
       [Tru64  UNIX]  DCE  Episode  File  System  [Tru64 UNIX]	Process File System (used by debuggers) [Tru64 UNIX]  Advanced File System (AdvFS)
       [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

OPERANDS

       The name of a file, or file system, about which information is solicited.

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

DESCRIPTION

       [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 displayed.

       [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 /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  system name or device name.  The command displays the mount point, the mounted device, the number of free blocks (in 512-byte quanti-
       ties), 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  file-
       set  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 constrained 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 available 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 domain_name#fileset_name.	[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 clone fileset, 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 available 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]  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.

RESTRICTIONS

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

EXIT STATUS

       The following exit values are returned: Successful completion.  An error occurred.

ENVIRONMENT VARIABLES

       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 util-
       ity 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 inter-
       nationalization	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  messages
       written to standard error.  Determines the location of message catalogues for the processing of LC_MESSAGES.

SEE ALSO

       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)

																	     df(1)