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32 .\" @(#)df.1 8.3 (Berkeley) 5/8/95
33 .\" $FreeBSD: src/bin/df/df.1,v 1.18.2.9 2003/05/07 23:56:14 trhodes Exp $
34 .\" $DragonFly: src/bin/df/df.1,v 1.3 2006/02/17 19:33:30 swildner Exp $
35 .\"
36 .Dd June 10, 2009
37 .Dt DF 1
38 .Os
39 .Sh NAME
40 .Nm df
41 .Nd display free disk space
42 .Sh SYNOPSIS
43 .Nm
44 .Oo
45 .Fl b | h | H | k |
46 .Fl m | P
47 .Oc
48 .Op Fl ailn
49 .Op Fl t Ar type
50 .Op Ar file | filesystem ...
51 .Sh DESCRIPTION
52 The
53 .Nm
54 utility
55 displays statistics about the amount of free disk space on the specified
56 .Ar file system
57 or on the file system of which
58 .Ar file
59 is a part.
60 Values are displayed in 512-byte per block counts.
61 If neither a file or a file system operand is specified,
62 statistics for all mounted file systems are displayed
63 (subject to the
64 .Fl t
65 option below).
66 .Pp
67 The following options are available:
68 .Bl -tag -width Ds
69 .It Fl a
70 Show all mount points, including those that were mounted with the
71 .Cm ignore
72 option.
73 .It Fl b
74 Use 512-byte blocks rather than the default. Note that
75 this overrides the
76 .Ev BLOCKSIZE
77 specification from the environment.
78 .It Fl g
79 Use 1073741824-byte (1-Gbyte) blocks rather than the default. Note that
80 this overrides the
81 .Ev BLOCKSIZE
82 specification from the environment.
83 .It Fl H
84 "Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte,
85 Gigabyte, Terabyte and Petabyte in order to reduce the number of
86 digits to four or fewer using base 10 for sizes.
87 .It Fl h
88 "Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte,
89 Gigabyte, Terabyte and Petabyte in order to reduce the number of
90 digits to four or fewer using base 2 for sizes.
91 .It Fl i
92 Include statistics on the number of free inodes.
93 .It Fl k
94 Use 1024-byte (1-Kbyte) blocks rather than the default. Note that
95 this overrides the
96 .Ev BLOCKSIZE
97 specification from the environment.
98 .It Fl l
99 Only display information about locally-mounted file systems.
100 .It Fl m
101 Use 1048576-byte (1-Mbyte) blocks rather than the default. Note that
102 this overrides the
103 .Ev BLOCKSIZE
104 specification from the environment.
105 .It Fl n
106 Print out the previously obtained statistics from the file systems.
107 This option should be used if it is possible that one or more
108 file systems are in a state such that they will not be able to provide
109 statistics without a long delay.
110 When this option is specified,
111 .Nm
112 will not request new statistics from the file systems, but will respond
113 with the possibly stale statistics that were previously obtained.
114 .It Fl P
115 Use POSIX compliant output of 512-byte blocks rather than the default.
116 Note that this overrides the
117 .Ev BLOCKSIZE
118 specification from the environment.
119 .It Fl t
120 Only print out statistics for file systems of the specified types.
121 More than one type may be specified in a comma separated list.
122 The list of file system types can be prefixed with
123 .Dq no
124 to specify the file system types for which action should
125 .Em not
126 be taken.
127 For example, the
128 .Nm
129 command:
130 .Bd -literal -offset indent
131 df -t nonfs,nullfs
132 .Ed
133 .Pp
134 lists all file systems except those of type
135 .Tn NFS
136 and
137 .Tn NULLFS .
138 The
139 .Xr lsvfs 1
140 command can be used to find out the types of file systems
141 that are available on the system.
142 .El
143 .Sh ENVIRONMENT
144 .Bl -tag -width BLOCKSIZE
145 .It Ev BLOCKSIZE
146 If the environment variable
147 .Ev BLOCKSIZE
148 is set, the block counts will be displayed in units of that size block.
149 .El
150 .Sh SEE ALSO
151 .Xr lsvfs 1 ,
152 .Xr quota 1 ,
153 .Xr fstatfs 2 ,
154 .Xr getfsstat 2 ,
155 .Xr statfs 2 ,
156 .Xr getmntinfo 3 ,
157 .Xr fstab 5 ,
158 .Xr mount 8 ,
159 .Xr quot 8
160 .Sh HISTORY
161 A
162 .Nm
163 command appeared in
164 .At v1 .
165 .Sh BUGS
166 The
167 .Fl n
168 and
169 .Fl t
170 flags are ignored if a file or file system is specified.