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+.\"	$NetBSD: df.1,v 1.49 2018/08/26 23:34:52 sevan Exp $
+.\"
+.\" Copyright (c) 1989, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)df.1	8.2 (Berkeley) 1/13/92
+.\"
+.Dd August 27, 2018
+.Dt DF 1
+.Os
+.Sh NAME
+.Nm df
+.Nd display free disk space
+.Sh SYNOPSIS
+.Nm
+.Op Fl agln
+.Op Fl Ghkm | Fl ihkm | Fl Pk
+.Op Fl t Ar type
+.Op Ar file | Ar file_system ...
+.Sh DESCRIPTION
+.Nm
+displays statistics about the amount of free disk space on the specified
+.Ar file_system
+or on the file system of which
+.Ar file
+is a part.
+By default, all sizes are reported in 512-byte block counts.
+If neither a file or a
+.Ar file_system
+operand is specified,
+statistics for all mounted file systems are displayed
+(subject to the
+.Fl l
+and
+.Fl t
+options below).
+.Pp
+Note that the printed count of available blocks takes
+.Va minfree
+into account, and thus will be negative when the number of free blocks
+on the filesystem is less than
+.Va minfree .
+.Pp
+The following options are available:
+.Bl -tag -width Ds
+.It Fl a
+Show all mount points,
+including those that were mounted with the
+.Dv MNT_IGNORE
+flag.
+.It Fl G
+Display all the fields of the structure(s) returned by
+.Xr statvfs 2 .
+This option cannot be used with the
+.Fl i
+or
+.Fl P
+options, and it is modelled after the Solaris
+.Fl g
+option.
+This option will override the
+.Fl g ,
+.Fl h ,
+.Fl k ,
+and
+.Fl m
+options, as well as any setting of
+.Ev BLOCKSIZE .
+.It Fl g
+The
+.Fl g
+option causes the numbers to be reported in gigabytes (1024*1024*1024
+bytes).
+.It Fl h
+"Human-readable" output.
+Use unit suffixes: Byte, Kilobyte, Megabyte,
+Gigabyte, Terabyte, Petabyte, Exabyte in order to reduce the number of
+digits to four or less.
+.It Fl i
+Include statistics on the number of free inodes.
+.It Fl k
+By default, all sizes are reported in 512-byte block counts.
+The
+.Fl k
+option causes the numbers to be reported in kilobytes (1024 bytes).
+.It Fl l
+Display statistics only about mounted file systems with the
+.Dv MNT_LOCAL
+flag set.
+If a non-local file system is given as an argument, a
+warning is issued and no information is given on that file system.
+.It Fl m
+The
+.Fl m
+option causes the numbers to be reported in megabytes (1024*1024 bytes).
+.It Fl n
+Print out the previously obtained statistics from the file systems.
+This option should be used if it is possible that one or more
+file systems are in a state such that they will not be able to provide
+statistics without a long delay.
+When this option is specified,
+.Nm
+will not request new statistics from the file systems, but will respond
+with the possibly stale statistics that were previously obtained.
+.It Fl P
+Produce output in the following portable format:
+.Pp
+If both the
+.Fl P
+and
+.Fl k
+option are specified, the output will be preceded by the following header
+line, formatted to match the data following it:
+.Bd -literal
+"Filesystem 1024-blocks Used Available Capacity Mounted on\en"
+.Ed
+.Pp
+If the
+.Fl P
+option is specified without the
+.Fl k
+options, the output will be preceded by the following header line,
+formatted to match the data following it:
+.Bd -literal
+"Filesystem <blksize>-blocks Used Available Capacity Mounted on\en"
+.Ed
+.Pp
+The header line is followed by data formatted as follows:
+.Bd -literal
+"%s %d %d %d %d%% %s\en", <file system name>, <total space>,
+    <space used>, <space free>, <percentage used>,
+    <file system root>
+.Ed
+.Pp
+Note that the
+.Fl i
+option may not be specified with
+.Fl P .
+.It Fl t Ar type
+Is used to indicate the actions should only be taken on
+filesystems of the specified type.
+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.
+If a file system is given on the command line that is not of
+the specified type, a warning is issued and no information is given on
+that file system.
+.El
+.Sh ENVIRONMENT
+.Bl -tag -width BLOCKSIZE
+.It Ev BLOCKSIZE
+If the environment variable
+.Ev BLOCKSIZE
+is set, and the
+.Fl g ,
+.Fl h ,
+.Fl k
+and
+.Fl m
+options are not specified, the block counts will be displayed in units of that
+size block.
+.El
+.Sh SEE ALSO
+.Xr quota 1 ,
+.Xr fstatvfs 2 ,
+.Xr getvfsstat 2 ,
+.Xr statvfs 2 ,
+.Xr getbsize 3 ,
+.Xr getmntinfo 3 ,
+.Xr fs 5 ,
+.Xr fstab 5 ,
+.Xr mount 8 ,
+.Xr quot 8 ,
+.Xr tunefs 8
+.Sh HISTORY
+A
+.Nm
+utility appeared in
+.At v1 .