141 lines
4.1 KiB
Groff
141 lines
4.1 KiB
Groff
.\" $NetBSD: du.1,v 1.9 2000/12/30 16:00:33 hubertf Exp $
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.\"
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)du.1 8.2 (Berkeley) 4/1/94
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.\"
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.Dd October 4, 1996
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.Dt DU 1
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.Os
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.Sh NAME
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.Nm du
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.Nd display disk usage statistics
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.Sh SYNOPSIS
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.Nm
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.Op Fl H | Fl L | Fl P
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.Op Fl a | Fl s
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.Op Fl ckmrx
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.Op Ar file ...
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.Sh DESCRIPTION
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The
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.Nm
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utility displays the file system block usage for each file argument
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and for each directory in the file hierarchy rooted in each directory
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argument.
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If no file is specified, the block usage of the hierarchy rooted in
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the current directory is displayed.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl H
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Symbolic links on the command line are followed.
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(Symbolic links encountered in the tree traversal are not followed.)
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.It Fl L
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All symbolic links are followed.
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.It Fl P
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No symbolic links are followed.
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.It Fl a
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Display an entry for each file in the file hierarchy.
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.It Fl k
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By default,
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.Nm
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displays the number of blocks as returned by the
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.Xr stat 2
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system call, i.e. 512-byte blocks.
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If the
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.Fl k
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flag is specified, the number displayed is the number of kilobyte
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(1024 bytes) blocks. Partial numbers of blocks are rounded up.
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.It Fl m
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If the
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.Fl m
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flag is specified, the number displayed is the number of megabyte
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(1024*1024 bytes) blocks.
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.It Fl c
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Display the grand total after all the arguments have been processed.
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.It Fl r
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Generate warning messages about directories that cannot be read.
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This is the default behaviour.
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.It Fl s
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Display only the grand total for the specified files.
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.It Fl x
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Filesystem mount points are not traversed.
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.El
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.Pp
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.Nm
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counts the storage used by symbolic links and not the files they
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reference unless the
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.Fl H
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or
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.Fl L
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option is specified.
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If either the
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.Fl H
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or
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.Fl L
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options are specified, storage used by any symbolic links which are
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followed is not counted or displayed.
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The
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.Fl H ,
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.Fl L
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and
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.Fl P
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options override each other and the command's actions are determined
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by the last one specified.
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.Pp
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Files having multiple hard links are counted (and displayed) a single
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time per
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.Nm
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execution.
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.Sh ENVIRONMENT VARIABLES
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.Bl -tag -width BLOCKSIZE
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.It Ev BLOCKSIZE
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If the environment variable
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.Ev BLOCKSIZE
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is set, and the
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.Fl k
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and
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.Fl m
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options are not specified, the block counts will be displayed in units of that
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size block.
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.El
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.Sh SEE ALSO
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.Xr df 1 ,
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.Xr fts 3 ,
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.Xr symlink 7 ,
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.Xr quot 8
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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