.\" $OpenBSD: deroff.1,v 1.10 2017/10/17 22:47:58 schwarze Exp $
.\"
.\" Copyright (c) 1990, 1993
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.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
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.\" Copyright (C) Caldera International Inc.  2001-2002.
.\" All rights reserved.
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.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code and documentation must retain the above
.\"    copyright notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed or owned by Caldera
.\"	International, Inc.
.\" 4. Neither the name of Caldera International, Inc. nor the names of other
.\"    contributors may be used to endorse or promote products derived from
.\"    this software without specific prior written permission.
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.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE FOR ANY DIRECT,
.\" INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"	@(#)deroff.1	8.1 (Berkeley) 6/6/93
.\"
.Dd $Mdocdate: October 17 2017 $
.Dt DEROFF 1
.Os
.Sh NAME
.Nm deroff
.Nd remove nroff/troff, eqn, pic and tbl constructs
.Sh SYNOPSIS
.Nm deroff
.Op Fl ikpw
.Oo
.Fl m
.Ar a | e | l | m | s
.Oc
.Op Ar
.Sh DESCRIPTION
.Nm deroff
reads each file in sequence and removes all roff
command lines, backslash constructions, macro definitions,
eqn constructs (between
.Dq .EQ
and
.Dq .EN
lines or between delimiters),
pic pictures,
and table descriptions and writes the remainder to the standard output.
.Nm
follows chains of included files
.Po
.Dq .so
and
.Dq .nx
commands
.Pc ;
if a file has already been included, a
.Dq .so
is ignored and a
.Dq .nx
terminates execution.
If no input file is given,
.Nm
reads from the standard input.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl i
Ignore
.Dq .so
and
.Dq .nx
commands.
.It Fl k
Keep blocks of text intact.
This is the default behavior unless the
.Fl m
option is given.
.It Fl m
Enable support for common macro packages.
The
.Fl m
option takes the following arguments:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It a
recognize
.Xr man 7
macros.
.It e
recognize me macros.
.It l
remove list constructs.
.It m
recognize mm macros.
.It s
recognize ms macros.
.El
.It Fl p
Preserve paragraph macros.
This option only has an effect if the
.Fl m
option is also specified.
.It Fl w
Output a word list, one
.Sq word
(string of letters, digits, and apostrophes, beginning with a letter;
apostrophes are removed) per line, and all other characters ignored.
Normally, the output follows the original, with the deletions mentioned above.
.El
.Sh SEE ALSO
.Xr man 7
.Sh HISTORY
.Nm
first appeared in
.At v7
and has been available since
.Ox 3.1 .
.Sh BUGS
.Nm
is not a complete troff interpreter,
so it can be confused by subtle constructs.
Most errors result in too much rather than too little output.
.Pp
The
.Fl ml
option does not correctly handle nested lists.