freebsd-dev/bin/df/df.1

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.\" Copyright (c) 1989, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" modification, are permitted provided that the following conditions
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.\" This product includes software developed by the University of
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.\" @(#)df.1 8.3 (Berkeley) 5/8/95
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.\" $FreeBSD$
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.\"
.Dd May 8, 1995
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.Dt DF 1
.Os
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.Sh NAME
.Nm df
.Nd display free disk space
.Sh SYNOPSIS
.Nm
.Oo
.Fl b | h | H | k |
.Fl m | P
.Oc
.Op Fl ailn
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.Op Fl t Ar type
.Op Ar file | filesystem ...
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.Sh DESCRIPTION
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.Nm Df
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displays statistics about the amount of free disk space on the specified
.Ar filesystem
or on the filesystem of which
.Ar file
is a part.
Values are displayed in 512-byte per block counts.
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If neither a file or a filesystem operand is specified,
statistics for all mounted filesystems are displayed
(subject to the
.Fl t
option below).
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl a
Show all mount points, including those that were mounted with the MNT_IGNORE
flag.
.It Fl b
Use 512-byte blocks rather than the default. Note that
this overrides the
.Ev BLOCKSIZE
specification from the environment.
.It Fl g
Use 1073741824-byte (1-Gbyte) blocks rather than the default. Note that
this overrides the
.Ev BLOCKSIZE
specification from the environment.
.It Fl H
"Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte,
Gigabyte, Terabyte and Petabyte in order to reduce the number of
digits to three or less using base 10 for sizes.
.It Fl h
"Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte,
Gigabyte, Terabyte and Petabyte in order to reduce the number of
digits to three or less using base 2 for sizes.
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.It Fl i
Include statistics on the number of free inodes.
.It Fl k
Use 1024-byte (1-Kbyte) blocks rather than the default. Note that
this overrides the
.Ev BLOCKSIZE
specification from the environment.
.It Fl l
Only display information about locally-mounted filesystems.
.It Fl m
Use 1048576-byte (1-Mbyte) blocks rather than the default. Note that
this overrides the
.Ev BLOCKSIZE
specification from the environment.
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.It Fl n
Print out the previously obtained statistics from the filesystems.
This option should be used if it is possible that one or more
filesystems are in a state such that they will not be able to provide
statistics without a long delay.
When this option is specified,
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.Nm
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will not request new statistics from the filesystems, but will respond
with the possibly stale statistics that were previously obtained.
.It Fl P
Use POSIX compliant output of 512-byte blocks rather than the default.
Note that this overrides the
.Ev BLOCKSIZE
specification from the environment.
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.It Fl t
Only print out statistics for filesystems of the specified types.
More than one type may be specified in a comma separated list.
The list of filesystem types can be prefixed with
.Dq no
to specify the filesystem types for which action should
.Em not
be taken.
For example, the
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.Nm
command:
.Bd -literal -offset indent
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df -t nonfs,nullfs
.Ed
.Pp
lists all filesystems except those of type
.Tn NFS
and
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.Tn NULLFS .
The
.Xr lsvfs 1
command can be used to find out the types of filesystems
that are available on the system.
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.El
.Sh ENVIRONMENT
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.Bl -tag -width BLOCKSIZE
.It Ev BLOCKSIZE
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If the environment variable
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.Ev BLOCKSIZE
is set, the block counts will be displayed in units of that size block.
.El
.Sh BUGS
The
.Fl n
and
.Fl t
flags are ignored if a file or filesystem is specified.
.Sh SEE ALSO
.Xr lsvfs 1 ,
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.Xr quota 1 ,
.Xr fstatfs 2 ,
.Xr getfsstat 2 ,
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.Xr statfs 2 ,
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.Xr getmntinfo 3 ,
.Xr fstab 5 ,
.Xr mount 8 ,
.Xr quot 8
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.Sh HISTORY
A
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.Nm
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command appeared in
.At v1 .