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Have demandoc throw away deroff's flags.

.\"	$Id: demandoc.1,v 1.2 2011/09/01 20:55:50 kristaps Exp $
.\"
.\" Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: September 1 2011 $
.Dt DEMANDOC 1
.Os
.Sh NAME
.Nm demandoc
.Nd emit only text of UNIX manuals
.Sh SYNOPSIS
.Nm demandoc
.Op Fl w
.Op Ar
.Sh DESCRIPTION
The
.Nm
utility emits only the text portions of well-formed
.Xr mdoc 7
and
.Xr man 7
.Ux
manual files.
Its arguments are as follows:
.Bl -tag -width Ds
.It Fl w
Output a word list.
This outputs each word of text on its own line.
A
.Qq word
starts with at least two letters and consists of at least three letters
total.
.It Ar
The input files.
.El
.Pp
If
.Ar file
is not provided,
.Nm
accepts standard input.
.Pp
By default,
.Nm
parses its input and outputs only text nodes, preserving line column
position.
If a document is not well-formed, it is skipped.
.Pp
The
.Fl i ,
.Fl k ,
.Fl m ,
and
.Fl p
flags are silently discarded for calling compatibility with the
historical deroff.
.Sh EXIT STATUS
The
.Nm
utility exits with one of the following values:
.Pp
.Bl -tag -width Ds -compact
.It 0
No errors occurred.
.It 6
An operating system error occurred, for example memory exhaustion or an
error accessing input files.
Such errors cause
.Nm
to exit at once, possibly in the middle of parsing or formatting a file.
The output databases are corrupt and should be removed .
.El
.Sh SEE ALSO
.Xr mandoc 1 ,
.Xr man 7
.Xr mdoc 7
.Sh HISTORY
.Nm
replaces the historical deroff utility for handling modern
.Xr man 7
and
.Xr mdoc 7
documents.
.Sh AUTHORS
The
.Nm
utility was written by
.An Kristaps Dzonsons ,
.Mt kristaps@bsd.lv .