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+.\"	$NetBSD: du.1,v 1.23 2012/05/14 21:14:14 wiz Exp $
+.\"
+.\" Copyright (c) 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.
+.\"
+.\"	@(#)du.1	8.2 (Berkeley) 4/1/94
+.\"
+.Dd May 14, 2012
+.Dt DU 1
+.Os
+.Sh NAME
+.Nm du
+.Nd display disk usage statistics
+.Sh SYNOPSIS
+.Nm
+.Op Fl H | Fl L | Fl P
+.Op Fl a | Fl d Ar depth | Fl s
+.Op Fl cghikmnrx
+.Op Ar file ...
+.Sh DESCRIPTION
+The
+.Nm
+utility displays the file system usage for each file argument
+and for each directory in the file hierarchy rooted in each directory
+argument.
+If no file is specified, the block usage of the hierarchy rooted in
+the current directory is displayed.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl H
+Symbolic links on the command line are followed.
+(Symbolic links encountered in the tree traversal are not followed.)
+.It Fl L
+All symbolic links are followed.
+.It Fl P
+No symbolic links are followed.
+.It Fl a
+Display an entry for each file in the file hierarchy.
+.It Fl c
+Display the grand total after all the arguments have been processed.
+.It Fl d
+Display an entry files and directories
+.Ar depth
+directories deep.
+.It Fl g
+If the
+.Fl g
+flag is specified, the number displayed is the number of gigabyte
+(1024*1024*1024 bytes) blocks.
+.It Fl h
+If the
+.Fl h
+flag is specified, the numbers will be displayed in "human-readable"
+format.
+Use unit suffixes: B (Byte), K (Kilobyte), M (Megabyte), G (Gigabyte),
+T (Terabyte) and P (Petabyte).
+.It Fl i
+Output inode usage instead of blocks.
+All "human-readable" options are ignored.
+.It Fl k
+By default,
+.Nm
+displays the number of blocks as returned by the
+.Xr stat 2
+system call, i.e. 512-byte blocks.
+If the
+.Fl k
+flag is specified, the number displayed is the number of kilobyte
+(1024 bytes) blocks.
+Partial numbers of blocks are rounded up.
+.It Fl m
+If the
+.Fl m
+flag is specified, the number displayed is the number of megabyte
+(1024*1024 bytes) blocks.
+.It Fl n
+Ignore files and directories with user
+.Qq nodump
+flag
+.Pq Dv UF_NODUMP
+set.
+.It Fl r
+Generate warning messages about directories that cannot be read.
+This is the default behaviour.
+.It Fl s
+Display only the grand total for the specified files.
+.It Fl x
+Filesystem mount points are not traversed.
+.El
+.Pp
+.Nm
+counts the storage used by symbolic links and not the files they
+reference unless the
+.Fl H
+or
+.Fl L
+option is specified.
+If either the
+.Fl H
+or
+.Fl L
+options are specified, storage used by any symbolic links which are
+followed is not counted or displayed.
+The
+.Fl H ,
+.Fl L
+and
+.Fl P
+options override each other and the command's actions are determined
+by the last one specified.
+.Pp
+Files having multiple hard links are counted (and displayed) a single
+time per
+.Nm
+execution.
+.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 EXIT STATUS
+.Ex -std
+.Sh SEE ALSO
+.Xr df 1 ,
+.Xr chflags 2 ,
+.Xr fts 3 ,
+.Xr getbsize 3 ,
+.Xr symlink 7 ,
+.Xr quot 8
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v6 .