1.\" Copyright (c) 1989, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)df.1 8.3 (Berkeley) 5/8/95 29.\" $FreeBSD: src/bin/df/df.1,v 1.18.2.9 2003/05/07 23:56:14 trhodes Exp $ 30.\" $DragonFly: src/bin/df/df.1,v 1.3 2006/02/17 19:33:30 swildner Exp $ 31.\" 32.Dd June 10, 2009 33.Dt DF 1 34.Os 35.Sh NAME 36.Nm df 37.Nd display free disk space 38.Sh SYNOPSIS 39.Nm 40.Oo 41.Fl b | h | H | k | 42.Fl m | P 43.Oc 44.Op Fl ailn 45.Op Fl t Ar type 46.Op Ar file | filesystem ... 47.Sh DESCRIPTION 48The 49.Nm 50utility 51displays statistics about the amount of free disk space on the specified 52.Ar file system 53or on the file system of which 54.Ar file 55is a part. 56Values are displayed in 512-byte per block counts. 57If neither a file or a file system operand is specified, 58statistics for all mounted file systems are displayed 59(subject to the 60.Fl t 61option below). 62.Pp 63The following options are available: 64.Bl -tag -width Ds 65.It Fl a 66Show all mount points, including those that were mounted with the 67.Cm ignore 68option. 69.It Fl b 70Use 512-byte blocks rather than the default. Note that 71this overrides the 72.Ev BLOCKSIZE 73specification from the environment. 74.It Fl g 75Use 1073741824-byte (1-Gbyte) blocks rather than the default. Note that 76this overrides the 77.Ev BLOCKSIZE 78specification from the environment. 79.It Fl H 80"Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, 81Gigabyte, Terabyte and Petabyte in order to reduce the number of 82digits to four or fewer using base 10 for sizes. 83.It Fl h 84"Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, 85Gigabyte, Terabyte and Petabyte in order to reduce the number of 86digits to four or fewer using base 2 for sizes. 87.It Fl i 88Include statistics on the number of free inodes. 89.It Fl k 90Use 1024-byte (1-Kbyte) blocks rather than the default. Note that 91this overrides the 92.Ev BLOCKSIZE 93specification from the environment. 94.It Fl l 95Only display information about locally-mounted file systems. 96.It Fl m 97Use 1048576-byte (1-Mbyte) blocks rather than the default. Note that 98this overrides the 99.Ev BLOCKSIZE 100specification from the environment. 101.It Fl n 102Print out the previously obtained statistics from the file systems. 103This option should be used if it is possible that one or more 104file systems are in a state such that they will not be able to provide 105statistics without a long delay. 106When this option is specified, 107.Nm 108will not request new statistics from the file systems, but will respond 109with the possibly stale statistics that were previously obtained. 110.It Fl P 111Use POSIX compliant output of 512-byte blocks rather than the default. 112Note that this overrides the 113.Ev BLOCKSIZE 114specification from the environment. 115.It Fl t 116Only print out statistics for file systems of the specified types. 117More than one type may be specified in a comma separated list. 118The list of file system types can be prefixed with 119.Dq no 120to specify the file system types for which action should 121.Em not 122be taken. 123For example, the 124.Nm 125command: 126.Bd -literal -offset indent 127df -t nonfs,nullfs 128.Ed 129.Pp 130lists all file systems except those of type 131.Tn NFS 132and 133.Tn NULLFS . 134The 135.Xr lsvfs 1 136command can be used to find out the types of file systems 137that are available on the system. 138.El 139.Sh ENVIRONMENT 140.Bl -tag -width BLOCKSIZE 141.It Ev BLOCKSIZE 142If the environment variable 143.Ev BLOCKSIZE 144is set, the block counts will be displayed in units of that size block. 145.El 146.Sh SEE ALSO 147.Xr lsvfs 1 , 148.Xr quota 1 , 149.Xr fstatfs 2 , 150.Xr getfsstat 2 , 151.Xr statfs 2 , 152.Xr getmntinfo 3 , 153.Xr fstab 5 , 154.Xr mount 8 , 155.Xr quot 8 156.Sh HISTORY 157A 158.Nm 159command appeared in 160.At v1 . 161.Sh BUGS 162The 163.Fl n 164and 165.Fl t 166flags are ignored if a file or file system is specified. 167