du/du.1

   1 .\"     $NetBSD: du.1,v 1.8 1998/02/15 17:08:17 kleink Exp $
   2 .\"
   3 .\" Copyright (c) 1990, 1993
   4 .\"     The Regents of the University of California.  All rights reserved.
   5 .\"
   6 .\" Redistribution and use in source and binary forms, with or without
   7 .\" modification, are permitted provided that the following conditions
   8 .\" are met:
   9 .\" 1. Redistributions of source code must retain the above copyright
  10 .\"    notice, this list of conditions and the following disclaimer.
  11 .\" 2. Redistributions in binary form must reproduce the above copyright
  12 .\"    notice, this list of conditions and the following disclaimer in the
  13 .\"    documentation and/or other materials provided with the distribution.
  14 .\" 3. All advertising materials mentioning features or use of this software
  15 .\"    must display the following acknowledgement:
  16 .\"     This product includes software developed by the University of
  17 .\"     California, Berkeley and its contributors.
  18 .\" 4. Neither the name of the University nor the names of its contributors
  19 .\"    may be used to endorse or promote products derived from this software
  20 .\"    without specific prior written permission.
  21 .\"
  22 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32 .\" SUCH DAMAGE.
  33 .\"
  34 .\"     @(#)du.1        8.2 (Berkeley) 4/1/94
  35 .\"
  36 .Dd October 4, 1996
  37 .Dt DU 1
  38 .Os
  39 .Sh NAME
  40 .Nm du
  41 .Nd display disk usage statistics
  42 .Sh SYNOPSIS
  43 .Nm
  44 .Op Fl H | Fl L | Fl P
  45 .Op Fl a | Fl s
  46 .Op Fl ckrx
  47 .Op Ar file ...
  48 .Sh DESCRIPTION
  49 The
  50 .Nm
  51 utility displays the file system block usage for each file argument
  52 and for each directory in the file hierarchy rooted in each directory
  53 argument.
  54 If no file is specified, the block usage of the hierarchy rooted in
  55 the current directory is displayed.
  56 .Pp
  57 The options are as follows:
  58 .Bl -tag -width Ds
  59 .It Fl H
  60 Symbolic links on the command line are followed.
  61 (Symbolic links encountered in the tree traversal are not followed.)
  62 .It Fl L
  63 All symbolic links are followed.
  64 .It Fl P
  65 No symbolic links are followed.
  66 .It Fl a
  67 Display an entry for each file in the file hierarchy.
  68 .It Fl k
  69 By default,
  70 .Nm
  71 displays the number of blocks as returned by the
  72 .Xr stat  2
  73 system call, i.e. 512-byte blocks.
  74 If the
  75 .Fl k
  76 flag is specified, the number displayed is the number of 1024-byte
  77 blocks.
  78 Partial numbers of blocks are rounded up.
  79 .It Fl c
  80 Display the grand total after all the arguments have been processed.
  81 .It Fl r
  82 Generate warning messages about directories that cannot be read.
  83 This is the default behaviour.
  84 .It Fl s
  85 Display only the grand total for the specified files.
  86 .It Fl x
  87 Filesystem mount points are not traversed.
  88 .El
  89 .Pp
  90 .Nm
  91 counts the storage used by symbolic links and not the files they
  92 reference unless the
  93 .Fl H
  94 or
  95 .Fl L
  96 option is specified.
  97 If either the
  98 .Fl H
  99 or
 100 .Fl L
 101 options are specified, storage used by any symbolic links which are
 102 followed is not counted or displayed.
 103 The
 104 .Fl H ,
 105 .Fl L
 106 and
 107 .Fl P
 108 options override each other and the command's actions are determined
 109 by the last one specified.
 110 .Pp
 111 Files having multiple hard links are counted (and displayed) a single
 112 time per
 113 .Nm
 114 execution.
 115 .Sh ENVIRONMENT VARIABLES
 116 .Bl -tag -width BLOCKSIZE
 117 .It Ev BLOCKSIZE
 118 If the environment variable
 119 .Ev BLOCKSIZE
 120 is set, and the
 121 .Fl k
 122 option is not specified, the block counts will be displayed in units of that
 123 size block.
 124 .El
 125 .Sh SEE ALSO
 126 .Xr df 1 ,
 127 .Xr fts 3 ,
 128 .Xr symlink 7 ,
 129 .Xr quot 8
 130 .Sh HISTORY
 131 A
 132 .Nm
 133 command appeared in
 134 .At v6 .