xref: /freebsd/bin/df/df.1 (revision bb15ca603fa442c72dde3f3cb8b46db6970e3950)
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29.\"     @(#)df.1	8.3 (Berkeley) 5/8/95
30.\" $FreeBSD$
31.\"
32.Dd October 18, 2011
33.Dt DF 1
34.Os
35.Sh NAME
36.Nm df
37.Nd display free disk space
38.Sh SYNOPSIS
39.Nm
40.Op Fl b | g | H | h | k | m | P
41.Op Fl acilnT
42.Op Fl t Ar type
43.Op Ar file | filesystem ...
44.Sh DESCRIPTION
45The
46.Nm
47utility
48displays statistics about the amount of free disk space on the specified
49.Ar file system
50or on the file system of which
51.Ar file
52is a part.
53Values are displayed in 512-byte per block counts.
54If neither a file or a file system operand is specified,
55statistics for all mounted file systems are displayed
56(subject to the
57.Fl t
58option below).
59.Pp
60The following options are available:
61.Bl -tag -width indent
62.It Fl a
63Show all mount points, including those that were mounted with the
64.Dv MNT_IGNORE
65flag.
66This is implied for file systems specified on the command line.
67.It Fl b
68Use 512-byte blocks rather than the default.
69Note that
70this overrides the
71.Ev BLOCKSIZE
72specification from the environment.
73.It Fl c
74Display a grand total.
75.It Fl g
76Use 1073741824-byte (1-Gbyte) blocks rather than the default.
77Note that
78this overrides the
79.Ev BLOCKSIZE
80specification from the environment.
81.It Fl H
82.Dq Human-readable
83output.
84Use unit suffixes: Byte, Kilobyte, Megabyte,
85Gigabyte, Terabyte and Petabyte in order to reduce the number of
86digits to four or fewer using base 10 for sizes.
87.It Fl h
88.Dq Human-readable
89output.
90Use unit suffixes: Byte, Kilobyte, Megabyte,
91Gigabyte, Terabyte and Petabyte in order to reduce the number of
92digits to four or fewer using base 2 for sizes.
93Inodes statistics, if enabled with
94.Fl i ,
95are always printed in base 10.
96.It Fl i
97Include statistics on the number of free inodes.
98.It Fl k
99Use 1024-byte (1-Kbyte) blocks rather than the default.
100Note that
101this overrides the
102.Ev BLOCKSIZE
103specification from the environment.
104.It Fl l
105Only display information about locally-mounted file systems.
106.It Fl m
107Use 1048576-byte (1-Mbyte) blocks rather than the default.
108Note that
109this overrides the
110.Ev BLOCKSIZE
111specification from the environment.
112.It Fl n
113Print out the previously obtained statistics from the file systems.
114This option should be used if it is possible that one or more
115file systems are in a state such that they will not be able to provide
116statistics without a long delay.
117When this option is specified,
118.Nm
119will not request new statistics from the file systems, but will respond
120with the possibly stale statistics that were previously obtained.
121.It Fl P
122Use POSIX compliant output of 512-byte blocks rather than the default.
123Note that this overrides the
124.Ev BLOCKSIZE
125specification from the environment.
126.It Fl t
127Only print out statistics for file systems of the specified types.
128More than one type may be specified in a comma separated list.
129The list of file system types can be prefixed with
130.Dq no
131to specify the file system types for which action should
132.Em not
133be taken.
134For example, the
135.Nm
136command:
137.Bd -literal -offset indent
138df -t nonfs,nullfs
139.Ed
140.Pp
141lists all file systems except those of type
142.Tn NFS
143and
144.Tn NULLFS .
145The
146.Xr lsvfs 1
147command can be used to find out the types of file systems
148that are available on the system.
149.It Fl T
150Include file system type.
151.El
152.Sh ENVIRONMENT
153.Bl -tag -width BLOCKSIZE
154.It Ev BLOCKSIZE
155If the environment variable
156.Ev BLOCKSIZE
157is set, the block counts will be displayed in units of that size block.
158.El
159.Sh SEE ALSO
160.Xr lsvfs 1 ,
161.Xr quota 1 ,
162.Xr fstatfs 2 ,
163.Xr getfsstat 2 ,
164.Xr statfs 2 ,
165.Xr getmntinfo 3 ,
166.Xr fstab 5 ,
167.Xr mount 8 ,
168.Xr quot 8
169.Sh HISTORY
170A
171.Nm
172command appeared in
173.At v1 .
174.Sh BUGS
175The
176.Fl n
177flag is ignored if a file or file system is specified.
178Also, if a mount
179point is not accessible by the user, it is possible that the file system
180information could be stale.
181