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.\" Copyright (c) 1989, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" 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 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 by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS 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 IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)apropos.1 8.1 (Berkeley) 6/29/93
.\"
.Dd June 29, 1993
.Dt APROPOS 1
.Os
.Sh NAME
.Nm apropos
.Nd locate commands by keyword lookup
.Sh SYNOPSIS
.Nm apropos
.Op Fl M Ar path
.Op Fl m Ar path
.Ar keyword ...
.Sh DESCRIPTION
.Nm Apropos
shows which manual pages contain instances of any of the given
.Ar keyword(s)
in their title line.
Each word is considered separately and case of letters is ignored.
Words which are part of other words are considered; when looking for
.Dq compile ,
.Nm apropos
will also list all instances of
.Dq compiler .
.Pp
If the line output by
.Nm apropos
starts
.Dq Li name(section) ...
you can enter
.Dq Li man section name
to get
its documentation.
.Pp
The options are as follows:
.Bl -tag -width flag
.It Fl M
Override the list of standard directories
.Nm apropos
searches for a database named
.Pa whatis.db .
The supplied
.Ar path
must be a colon
.Dq \&:
separated list of directories.
This search path may also be set using the environment variable
.Ev MANPATH .
.It Fl m
Augment the list of standard directories
.Nm apropos
searches for its database.
The supplied
.Ar path
must be a colon
.Dq \&:
separated list of directories.
These directories will be searched before the standard directories,
or the directories supplied with the
.Fl M
option or the
.Ev MANPATH
environment variable.
.Sh ENVIRONMENT
.Bl -tag -width MANPATH
.It Ev MANPATH
The standard search path used by
.Xr man 1
may be overridden by specifying a path in the
.Ev MANPATH
environment variable.
The format of the path is a colon
.Dq \&:
separated list of directories.
.El
.Sh FILES
.Bl -tag -width whatis.db -compact
.It Pa whatis.db
name of the apropos database
.El
.Sh SEE ALSO
.Xr man 1 ,
.Xr whatis 1 ,
.Xr whereis 1
.Sh HISTORY
The
.Nm apropos
command appeared in
.Bx 3.0 .
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