Get us a whatis(1) mode for apropos(1).

This is from a patch to tech@ as critiqued by schwarze@, checked in to
get the ball rolling.

1 files changed, 118 insertions, 0 deletions

diff --git a/whatis.1 b/whatis.1
new file mode 100644
index 00000000..a3f60fb8
--- /dev/null
+++ b/whatis.1
@@ -0,0 +1,118 @@
+.\"	$Id: whatis.1,v 1.1 2011/11/27 18:54:01 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: November 27 2011 $
+.Dt WHATIS 1
+.Os
+.Sh NAME
+.Nm whatis
+.Nd search manual page databases
+.Sh SYNOPSIS
+.Nm
+.Op Fl M Ar manpath
+.Op Fl m Ar manpath
+.Op Fl S Ar arch
+.Op Fl s Ar section
+.Ar term...
+.Sh DESCRIPTION
+The
+.Nm
+utility searches for manuals named or described with
+.Ar term
+in manual page databases generated by
+.Xr mandocdb 8 .
+Its arguments are as follows:
+.Bl -tag -width Ds
+.It Fl M Ar manpath
+Use the colon-separated path 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 paths 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 '~[[:<:]]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
+.Sh EXIT STATUS
+.Ex -std
+.Sh SEE ALSO
+.Xr apropos 1 ,
+.Xr man 1 ,
+.Xr mandoc 1 ,
+.Xr mandocdb 8
+.Sh AUTHORS
+The
+.Nm
+utility was written by
+.An Kristaps Dzonsons ,
+.Mt kristaps@bsd.lv .