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.\"	@(#)du.1	8.2 (Berkeley) 4/1/94
.\" $FreeBSD: src/usr.bin/du/du.1,v 1.15.2.9 2003/02/24 22:37:41 trhodes Exp $
.\"
.Dd April 1, 1994
.Dt DU 1
.Os
.Sh NAME
.Nm du
.Nd display disk usage statistics
.Sh SYNOPSIS
.Nm
.Op Fl H | L | P
.Op Fl I Ar mask
.Op Fl a | s | d Ar depth
.Op Fl c
.Op Fl h | k
.Op Fl x
.Op Fl t
.Op Ar
.Sh DESCRIPTION
The
.Nm
utility displays the file system block 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.
If the
.Fl k
flag is specified, the number of 1024-byte
blocks used by the file is displayed, otherwise
.Xr getbsize 3
is used to determine the preferred block size.
Partial numbers of blocks are rounded up.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl H
Symbolic links on the command line are followed, symbolic links in file
hierarchies are not followed.
.It Fl L
Symbolic links on the command line and in file hierarchies are followed.
.It Fl I Ar mask
Ignore files and directories matching the specified
.Ar mask .
.It Fl P
No symbolic links are followed.
This is the default.
.It Fl a
Display an entry for each file in a file hierarchy.
.It Fl h
"Human-readable" output.  Use unit suffixes: Byte, Kilobyte, Megabyte,
Gigabyte, Terabyte and Petabyte
.It Fl r
Generate messages about directories that cannot be read, files
that cannot be opened, and so on.  This is the default case.
This option exists solely for conformance with
.St -xpg4 .
.It Fl s
Display an entry for each specified file.
(Equivalent to
.Fl d Li 0 )
.It Fl t
Calculate the apparent size based on the file size (st_size) instead
of the actual media space used based on st_blkcnt.  This is meant to
give the caller an idea of how much data is present in actual transmittable
bytes if it was to be copied or sent elsewhere.
.Pp
To make this calculation
.Nm
uses st_size and assumes a media blocking granularity of 512 bytes.
Any holes present in the file are counted as transmittable data.
.It Fl d Ar depth
Display an entry for all files and directories
.Ar depth
directories deep.
.It Fl c
Display a grand total.
.It Fl k
Display block counts in 1024-byte (1-Kbyte) blocks.
.It Fl x
File system mount points are not traversed.
.El
.Pp
The
.Nm
utility 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.
.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 k
option is not specified, the block counts will be displayed in units of that
size block.
If
.Ev BLOCKSIZE
is not set, and the
.Fl k
option is not specified, the block counts will be displayed in 512-byte blocks.
.El
.Sh SEE ALSO
.Xr df 1 ,
.Xr fts 3 ,
.Xr symlink 7 ,
.Xr quot 8
.Sh HISTORY
A
.Nm
command appeared in
.At v1 .