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.\" $OpenBSD: df.1,v 1.44 2010/09/03 09:53:20 jmc Exp $
.\" $NetBSD: df.1,v 1.12 1995/12/05 02:42:45 jtc Exp $
.\"
.\" Copyright (c) 1989, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)df.1 8.2 (Berkeley) 1/13/92
.\"
.Dd $Mdocdate: September 3 2010 $
.Dt DF 1
.Os
.Sh NAME
.Nm df
.Nd display free disk space
.Sh SYNOPSIS
.Nm df
.Op Fl hiklnP
.Op Fl t Ar type
.Oo
.Op Ar file | file_system
.Ar ...
.Oc
.Sh DESCRIPTION
The
.Nm
utility displays statistics about the amount of free disk space on the
specified
.Ar file_system
or on the file system of which
.Ar file
is a part.
By default, values are displayed as 512-byte block counts.
If neither a file nor a
.Ar file_system
operand is specified,
statistics for all mounted file systems are displayed
(subject to the
.Fl l
and
.Fl t
options below).
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl h
"Human-readable" output.
Use unit suffixes: Byte, Kilobyte, Megabyte,
Gigabyte, Terabyte, Petabyte, Exabyte in order to reduce the number of
digits to four or less.
This option is incompatible with the
.Fl P
option.
.It Fl i
Include statistics on the number of free inodes.
This option is incompatible with the
.Fl P
option.
.It Fl k
By default, all sizes are reported in 512-byte block counts.
The
.Fl k
option causes the numbers to be reported in kilobyte counts.
.It Fl l
Display statistics only about mounted file systems with the
.Dv MNT_LOCAL
flag set.
If a non-local file system is given as an argument, a
warning is issued and no information is given on that file system.
.It Fl n
Print out the previously obtained statistics from the file systems.
This option should be used 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.
When this option is specified,
.Nm
will not request new statistics from the file systems, but will respond
with the possibly stale statistics that were previously obtained.
.It Fl P
Print out information in a stricter format designed to be parsed
by portable scripts.
.It Fl t Ar type
Indicate the actions should only be taken on
file systems of the specified
.Ar type .
More than one type may be specified in a comma-separated list.
The list of file system types can be prefixed with
.Dq no
to specify the file system types for which action should
.Em not
be taken.
If a file system is given on the command line that is not of
the specified type, a warning is issued and no information is given on
that file system.
.El
.Pp
It is not an error to specify more than one of
the mutually exclusive options
.Fl h
and
.Fl k .
Where more than one of these options is specified,
the last option given overrides the others.
.Sh ENVIRONMENT
.Bl -tag -width BLOCKSIZE
.It Ev BLOCKSIZE
If the environment variable
.Ev BLOCKSIZE
is set, and the
.Fl h
or
.Fl k
options are not specified, the block counts will be displayed in units of that
size block.
.El
.Sh EXIT STATUS
.Ex -std df
.Sh EXAMPLES
Output, in a strict format suitable for portable scripts, disk space
statistics for the
.Pa /usr
file system using kilobyte block sizes:
.Pp
.Dl $ df -kP /usr
.Sh SEE ALSO
.Xr quota 1 ,
.Xr getfsstat 2 ,
.Xr statfs 2 ,
.Xr getmntinfo 3 ,
.Xr fstab 5 ,
.Xr mount 8 ,
.Xr quot 8
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.
.Pp
The flags
.Op Fl hiln
are extensions to that specification.
.Pp
Behaviour for the
.Fl t
flag differs between this implementation and
.St -p1003.1-2008 .
.Sh HISTORY
A
.Nm
utility appeared in
.At v3 .
|
