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.\"	@(#)apropos.1	8.1 (Berkeley) 6/29/93
.\"
.Dd $Mdocdate: October 9 2011 $
.Dt APROPOS 1
.Os
.Sh NAME
.Nm apropos
.Nd locate commands by keyword lookup
.Sh SYNOPSIS
.Nm apropos
.Op Fl C Ar file
.Op Fl M Ar path
.Op Fl m Ar path
.Op Fl S Ar subsection
.Op Fl s Ar section
.Ar keyword ...
.Sh DESCRIPTION
.Nm
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
will also list all instances of
.Dq compiler .
.Pp
If the line output by
.Nm
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 "-C file"
.It Fl C Ar file
Specify an alternative configuration
.Ar file
in
.Xr man.conf 5
format.
.It Fl M Ar path
Override the list of standard directories
.Nm
searches for a database named
.Pa whatis.db .
The supplied
.Ar path
must be a colon
.Pq Sq \&:
separated list of directories.
This search path may also be set using the environment variable
.Ev MANPATH .
.It Fl m Ar path
Augment the list of standard directories
.Nm
searches for its database.
The supplied
.Ar path
must be a colon
.Pq Sq \&:
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.
.It Fl S Ar subsection
Restrict the search to pages for the specified machine architecture.
By default, pages for all architectures are shown.
.It Fl s Ar section
Restrict the search to the specified section of the manual.
By default, pages from all sections are shown.
.El
.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
.Pq Sq \&:
separated list of directories.
.El
.Sh FILES
.Bl -tag -width /etc/man.conf -compact
.It Pa whatis.db
name of the apropos database
.It Pa /etc/man.conf
default
.Xr man 1
configuration file
.El
.Sh SEE ALSO
.Xr man 1 ,
.Xr whatis 1 ,
.Xr whereis 1 ,
.Xr man.conf 5 ,
.Xr makewhatis 8
.Sh HISTORY
The
.Nm
command first appeared in
.Bx 2 .
.Pp
The
.Fl M
and
.Fl m
options first appeared in
.Bx 4.3 Reno ;
.Fl C
in
.Nx 1.0 ;
and
.Fl s
and
.Fl S
in
.Ox 4.5 .
.Sh AUTHORS
.An Bill Joy