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implement -C (alternative config file) for apropos(1) and mandocdb(8),
including various tweaks to the whatis(8) manual;
ok kristaps@

.\"	$Id: whatis.1,v 1.4 2011/12/12 02:00:49 schwarze 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: December 12 2011 $
.Dt WHATIS 1
.Os
.Sh NAME
.Nm whatis
.Nd search for manual pages by page names
.Sh SYNOPSIS
.Nm
.Op Fl C Ar file
.Op Fl M Ar manpath
.Op Fl m Ar manpath
.Op Fl S Ar arch
.Op Fl s Ar section
.Ar name ...
.Sh DESCRIPTION
The
.Nm
utility searches databases generated by
.Xr mandocdb 8
for manuals containing the word
.Ar name
in their page name, ignoring case.
It returns the header lines from all matching pages.
You can then use the
.Xr man 1
command to get more information.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl C Ar file
Specify an alternative configuration
.Ar file
in
.Xr man.conf 5
format.
.It Fl M Ar manpath
Use the colon-separated
.Ar manpath
instead of the default list of paths searched for
.Xr mandocdb 8
databases.
Invalid paths, or paths without manual databases, are ignored.
.It Fl m Ar manpath
Prepend the colon-separated
.Ar manpath
to the list of paths searched for
.Xr mandocdb 8
databases.
Invalid paths, or paths without manual databases, are ignored.
.It Fl S Ar arch
Search only for a particular architecture.
.It Fl s Ar cat
Search only for a manual section.
See
.Xr man 1
for a listing of manual sections.
.El
.Pp
By default,
.Nm
searches for
.Xr mandocdb 8
databases in the default paths stipulated by
.Xr man 1 .
Results are sorted by manual title, with output formatted as
.Pp
.D1 title(sec) \- description
.Pp
Where
.Qq title
is the manual's title (note multiple manual names may exist for one
title),
.Qq sec
is the manual section, and
.Qq description
is the manual's short description.
If an architecture is specified for the manual, it is displayed as
.Pp
.D1 title(cat/arch) \- description
.Pp
Resulting manuals may be accessed as
.Pp
.Dl $ man \-s sec title
.Pp
If an architecture is specified in the output, use
.Pp
.Dl $ man \-s sec \-S arch title
.Pp
.Nm
is identical to running
.Xr apropos 1
as follows:
.Pp
.Dl $ apropos -- -i 'Nm~[[:<:]]term[[:>:]]'
.Sh ENVIRONMENT
.Bl -tag -width Ds
.It Ev MANPATH
Colon-separated paths overriding the default list of paths searched for
manual databases.
Invalid paths, or paths without manual databases, are ignored.
Overridden by
.Fl M .
.El
.Sh FILES
.Bl -tag -width "/etc/man.conf" -compact
.It Pa mandoc.db
name of the
.Xr mandocdb 8
keyword database
.It Pa mandoc.index
name of the
.Xr mandocdb 8
filename database
.It Pa /etc/man.conf
default
.Xr man 1
configuration file
.El
.Sh EXIT STATUS
.Ex -std
.Sh SEE ALSO
.Xr apropos 1 ,
.Xr man 1 ,
.Xr man.conf 5 ,
.Xr mandocdb 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Bx 2 .
It was rewritten from scratch as part of the
.Xr mandocdb 8
project for
.Ox 5.1 .
.Sh AUTHORS
.An -nosplit
.An Bill Joy
wrote the original
.Bx
.Nm
in 1979.
The current version was written by
.An Kristaps Dzonsons ,
.Mt kristaps@bsd.lv .