181 lines
5.3 KiB
Groff
181 lines
5.3 KiB
Groff
.\"-
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.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)df.1 8.3 (Berkeley) 5/8/95
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.\" $FreeBSD$
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.\"
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.Dd October 18, 2011
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.Dt DF 1
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.Os
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.Sh NAME
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.Nm df
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.Nd display free disk space
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.Sh SYNOPSIS
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.Nm
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.Op Fl b | g | H | h | k | m | P
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.Op Fl acilnT
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.Op Fl t Ar type
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.Op Ar file | filesystem ...
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.Sh DESCRIPTION
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The
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.Nm
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utility
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displays statistics about the amount of free disk space on the specified
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.Ar file system
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or on the file system of which
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.Ar file
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is a part.
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Values are displayed in 512-byte per block counts.
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If neither a file or a file system operand is specified,
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statistics for all mounted file systems are displayed
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(subject to the
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.Fl t
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option below).
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl a
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Show all mount points, including those that were mounted with the
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.Dv MNT_IGNORE
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flag.
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This is implied for file systems specified on the command line.
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.It Fl b
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Use 512-byte blocks rather than the default.
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Note that
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this overrides the
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl c
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Display a grand total.
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.It Fl g
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Use 1073741824-byte (1-Gbyte) blocks rather than the default.
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Note that
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this overrides the
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl H
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.Dq Human-readable
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output.
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Use unit suffixes: Byte, Kilobyte, Megabyte,
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Gigabyte, Terabyte and Petabyte in order to reduce the number of
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digits to four or fewer using base 10 for sizes.
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.It Fl h
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.Dq Human-readable
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output.
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Use unit suffixes: Byte, Kilobyte, Megabyte,
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Gigabyte, Terabyte and Petabyte in order to reduce the number of
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digits to four or fewer using base 2 for sizes.
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Inodes statistics, if enabled with
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.Fl i ,
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are always printed in base 10.
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.It Fl i
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Include statistics on the number of free inodes.
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.It Fl k
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Use 1024-byte (1-Kbyte) blocks rather than the default.
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Note that
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this overrides the
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl l
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Only display information about locally-mounted file systems.
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.It Fl m
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Use 1048576-byte (1-Mbyte) blocks rather than the default.
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Note that
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this overrides the
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl n
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Print out the previously obtained statistics from the file systems.
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This option should be used if it is possible that one or more
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file systems are in a state such that they will not be able to provide
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statistics without a long delay.
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When this option is specified,
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.Nm
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will not request new statistics from the file systems, but will respond
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with the possibly stale statistics that were previously obtained.
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.It Fl P
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Use POSIX compliant output of 512-byte blocks rather than the default.
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Note that this overrides the
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl t
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Only print out statistics for file systems of the specified types.
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More than one type may be specified in a comma separated list.
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The list of file system types can be prefixed with
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.Dq no
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to specify the file system types for which action should
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.Em not
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be taken.
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For example, the
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.Nm
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command:
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.Bd -literal -offset indent
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df -t nonfs,nullfs
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.Ed
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.Pp
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lists all file systems except those of type
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.Tn NFS
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and
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.Tn NULLFS .
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The
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.Xr lsvfs 1
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command can be used to find out the types of file systems
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that are available on the system.
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.It Fl T
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Include file system type.
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.El
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.Sh ENVIRONMENT
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.Bl -tag -width BLOCKSIZE
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.It Ev BLOCKSIZE
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If the environment variable
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.Ev BLOCKSIZE
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is set, the block counts will be displayed in units of that size block.
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.El
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.Sh SEE ALSO
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.Xr lsvfs 1 ,
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.Xr quota 1 ,
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.Xr fstatfs 2 ,
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.Xr getfsstat 2 ,
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.Xr statfs 2 ,
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.Xr getmntinfo 3 ,
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.Xr fstab 5 ,
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.Xr mount 8 ,
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.Xr quot 8
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v1 .
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.Sh BUGS
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The
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.Fl n
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flag is ignored if a file or file system is specified.
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Also, if a mount
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point is not accessible by the user, it is possible that the file system
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information could be stale.
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