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1.\"- 2.\" Copyright (c) 1989, 1990, 1993 3.\" The Regents of the University of California. All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 4. Neither the name of the University nor the names of its contributors 14.\" may be used to endorse or promote products derived from this software 15.\" without specific prior written permission. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" @(#)df.1 8.3 (Berkeley) 5/8/95 30.\" $FreeBSD$ 31.\" 32.Dd March 3, 2012 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 pstat 1 , 162.Xr quota 1 , 163.Xr swapinfo 1 , 164.Xr fstatfs 2 , 165.Xr getfsstat 2 , 166.Xr statfs 2 , 167.Xr getmntinfo 3 , 168.Xr fstab 5 , 169.Xr mount 8 , 170.Xr quot 8 171.Sh HISTORY 172A 173.Nm 174command appeared in 175.At v1 . 176.Sh BUGS 177The 178.Fl n 179flag is ignored if a file or file system is specified. 180Also, if a mount 181point is not accessible by the user, it is possible that the file system 182information could be stale.