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Preliminary fixes to make the description of -s easier to understand,
and to clarify that fold(1) is intended to count display column positions
rather than characters.
More work is needed on the code to add UTF-8 support and to fix other
POSIX violations, and in that context, further updates to the manual
will also be needed.
Triggered by a different diff from Michal Mazurek <akfaew at jasminek dot net>.
OK on the wording jmc@, but he didn't check the content.
Part of the content verified by guenther@.

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.\"	@(#)fold.1	8.1 (Berkeley) 6/6/93
.\"
.Dd $Mdocdate: January 5 2016 $
.Dt FOLD 1
.Os
.Sh NAME
.Nm fold
.Nd fold long lines for finite width output device
.Sh SYNOPSIS
.Nm fold
.Op Fl bs
.Op Fl w Ar width
.Op Ar
.Sh DESCRIPTION
.Nm
is a filter which folds the contents of the specified files,
or the standard input if no files are specified,
breaking the lines to have a maximum of 80 display columns.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl b
Count
.Ar width
in bytes rather than column positions.
.It Fl s
If an output line would be broken after a non-blank character but
contains at least one blank character, break the line earlier,
after the last blank character.
This is useful to avoid line breaks in the middle of words, if
possible.
.It Fl w Ar width
Specifies a line width to use instead of the default of 80.
.El
.Sh EXIT STATUS
.Ex -std fold
.Sh SEE ALSO
.Xr expand 1
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.
.Sh HISTORY
The
.Nm
utility first appeared in
.Bx 1 .
It was rewritten for
.Bx 4.3 Reno
to improve speed and modernize style.
The
.Fl b
and
.Fl s
options were added to
.Nx 1.0
for
.St -p1003.2
compliance.
.Sh AUTHORS
.An -nosplit
.An Bill Joy
wrote the original version of
.Nm
on June 28, 1977.
.An Kevin Ruddy
rewrote the command in 1990, and
.An J. T. Conklin
added the missing options in 1993.
.Sh BUGS
If underlining (see
.Xr ul 1 )
is present it may be messed up by folding.
.Pp
.Ar width
should be a multiple of 8 if tabs are present, or the tabs should
be expanded using
.Xr expand 1
before using
.Nm fold .
.Pp
Multibyte character support is missing.