1.\" Copyright (c) 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)du.1 8.2 (Berkeley) 4/1/94 33.\" 34.Dd April 1, 1994 35.Dt DU 1 36.Os 37.Sh NAME 38.Nm du 39.Nd display disk usage statistics 40.Sh SYNOPSIS 41.Nm du 42.Op Fl H | Fl L | Fl P 43.Op Fl a | Fl s 44.Op Fl x 45.Op Ar file ... 46.Sh DESCRIPTION 47The 48.Nm du 49utility displays the file system block usage for each file argument 50and for each directory in the file hierarchy rooted in each directory 51argument. 52If no file is specified, the block usage of the hierarchy rooted in 53the current directory is displayed. 54The number of blocks are in the same units as that returned by the 55.Xr stat 2 56system call, i.e. 512-byte blocks. 57Partial numbers of blocks are rounded up. 58.Pp 59The options are as follows: 60.Bl -tag -width Ds 61.It Fl H 62Symbolic links on the command line are followed. 63(Symbolic links encountered in the tree traversal are not followed.) 64.It Fl L 65All symbolic links are followed. 66.It Fl P 67No symbolic links are followed. 68.It Fl a 69Display an entry for each file in the file hierarchy. 70.It Fl s 71Display only the grand total for the specified files. 72.It Fl x 73Filesystem mount points are not traversed. 74.El 75.Pp 76.Nm Du 77counts the storage used by symbolic links and not the files they 78reference unless the 79.Fl H 80or 81.Fl L 82option is specified. 83If either the 84.Fl H 85or 86.Fl L 87options are specified, storage used by any symbolic links which are 88followed is not counted or displayed. 89The 90.Fl H , 91.Fl L 92and 93.Fl P 94options override each other and the command's actions are determined 95by the last one specified. 96.Pp 97Files having multiple hard links are counted (and displayed) a single 98time per 99.Nm du 100execution. 101.Sh ENVIRONMENTAL VARIABLES 102.Bl -tag -width BLOCKSIZE 103.It Ev BLOCKSIZE 104If the environmental variable 105.Ev BLOCKSIZE 106is set, the block counts will be displayed in units of that size block. 107.El 108.Sh SEE ALSO 109.Xr df 1 , 110.Xr fts 3 , 111.Xr symlink 7 , 112.Xr quot 8 113.Sh HISTORY 114A 115.Nm du 116command appeared in 117.At v6 . 118