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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.
.\" Copyright (c) 2019
.\" Adélie Userland Team. 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 hks | Fl Pk
.Op Fl t
.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 t
option below).
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl h
"Human-readable" output.
Use powers of 1024 to reduce the number of digits to four or less, via
the IEEE prefixes (byte, kibibyte, mebibyte, and so on). This option
conflicts with the
.Fl k
and
.Fl s
options.
.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).
This option conflicts with the
.Fl h
and
.Fl s
options.
.It Fl P
Produce POSIX-compliant output, which is described as the following:
.Bd -literal
"Filesystem <blksize>-blocks Used Available Capacity Mounted On\en"
"%s %d %d %d %d%% %s\en", <file system name>, <total space>,
<space used>, <space free>, <percentage used>,
<file system root>
.Ed
Note that 'blksize' is 512 by default, and may be changed to 1024 via
the
.Fl k
option. No other options may be specified alongside the
.Fl P
option.
.It Fl s
"Human readable" output.
Use SI units (powers of 1000) to reduce the number of digits to four
or less (byte, kilobyte, megabyte, and so on). This option conflicts
with the
.Fl h
and
.Fl k
options.
.It Fl t
Show the type of the filesystems listed. This option cannot be used
with the
.Fl P
option.
.El
.Sh CONFORMANCE
This implementation of
.Nm
is fully conformant with POSIX.1-2017, with two extensions inspired by
GNU coreutils.
.Sh SEE ALSO
.Xr fstatvfs 2 ,
.Xr mount 2 ,
.Xr statvfs 2 ,
.Xr setmntent 3 ,
.Xr getmntent 3 ,
.Xr fs 5 ,
.Xr fstab 5
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