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correct use of .Nm; some other formatting nits

.\"	$OpenBSD: du.1,v 1.10 1999/07/04 11:53:53 aaron Exp $
.\"	$NetBSD: du.1,v 1.6 1996/10/18 07:20:31 thorpej Exp $
.\"
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.\"	@(#)du.1	8.2 (Berkeley) 4/1/94
.\"
.Dd October 4, 1996
.Dt DU 1
.Os
.Sh NAME
.Nm du
.Nd display disk usage statistics
.Sh SYNOPSIS
.Nm du
.Op Fl H | Fl L | Fl P
.Op Fl a | Fl s
.Op Fl ckrx
.Op Ar file ...
.Sh DESCRIPTION
The
.Nm
utility displays the file system block usage for each
.Ar file
argument
and for each directory in the file hierarchy rooted in each directory
argument.  Note that the system block usage is usually greater than
the actual size of the file.
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 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 1024-byte
blocks.
Partial numbers of blocks are rounded up.
.It Fl c
Display the grand total after all the arguments have been processed.
.It Fl s
Display only the grand total for the specified files.
.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 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 k
option is not specified, the block counts will be displayed in units of that
size block.
.El
.Sh SEE ALSO
.Xr df 1 ,
.Xr fts 3 ,
.Xr symlink 7 ,
.Xr quot 8
.Sh HISTORY
A
.Nm
command appeared in
.At v6 .