.\"	Id: man.1,v 1.21 2017/01/31 19:44:04 schwarze Exp 
.\"
.\" Copyright (c) 1989, 1990, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\" Copyright (c) 2003, 2007, 2008, 2014 Jason McIntyre <jmc@openbsd.org>
.\" Copyright (c) 2010, 2011, 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" 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. 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.
.\"
.\"     @(#)man.1	8.2 (Berkeley) 1/2/94
.\"
.Dd January 31, 2017
.Dt MAN 1
.Os
.Sh NAME
.Nm man
.Nd display manual pages
.Sh SYNOPSIS
.Nm man
.Op Fl acfhklw
.Op Fl C Ar file
.Op Fl I Cm os Ns = Ns Ar name
.Op Fl K Ar encoding
.Op Fl M Ar path
.Op Fl m Ar path
.Op Fl O Ar option Ns = Ns Ar value
.Op Fl S Ar subsection
.Op Fl s Ar section
.Op Fl T Ar output
.Op Fl W Ar level
.Op Ar section
.Ar name ...
.Sh DESCRIPTION
The
.Nm
utility
displays the
manual pages entitled
.Ar name .
Pages may be selected according to
a specific category
.Pq Ar section
or
machine architecture
.Pq Ar subsection .
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl a
Display all matching manual pages.
Normally, only the first page found is displayed.
.It Fl C Ar file
Use the specified
.Ar file
instead of the default configuration file.
This permits users to configure their own manual environment.
See
.Xr man.conf 5
for a description of the contents of this file.
.It Fl c
Copy the manual page to the standard output instead of using
.Xr more 1
to paginate it.
This is done by default if the standard output is not a terminal device.
.It Fl f
A synonym for
.Xr whatis 1 .
It searches for
.Ar name
in manual page names and displays the header lines from all matching pages.
The search is case insensitive and matches whole words only.
This overrides any earlier
.Fl k
and
.Fl l
options.
.It Fl h
Display only the SYNOPSIS lines of the requested manual pages.
Implies
.Fl a
and
.Fl c .
.It Fl I Cm os Ns = Ns Ar name
Override the default operating system
.Ar name
for the
.Xr mdoc 7
.Ic \&Os
and for the
.Xr man 7
.Ic \&TH
macro.
.It Fl K Ar encoding
Specify the input encoding.
The supported
.Ar encoding
arguments are
.Cm us-ascii ,
.Cm iso-8859-1 ,
and
.Cm utf-8 .
By default, the encoding is automatically detected as described in the
.Xr mandoc 1
manual.
.It Fl k
A synonym for
.Xr apropos 1 .
Instead of
.Ar name ,
an expression can be provided using the syntax described in the
.Xr apropos 1
manual.
By default, it displays the header lines of all matching pages.
This overrides any earlier
.Fl f
and
.Fl l
options.
.It Fl l
A synonym for
.Xr mandoc 1
.Fl a .
The
.Ar name
arguments are interpreted as filenames.
No search is done and
.Ar file ,
.Ar path ,
.Ar section ,
and
.Ar subsection
are ignored.
This overrides any earlier
.Fl f ,
.Fl k ,
and
.Fl w
options.
.It Fl M Ar path
Override the list of standard directories which
.Nm
searches for manual pages.
The supplied
.Ar path
must be a colon
.Pq Ql \&:
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 which
.Nm
searches for manual pages.
The supplied
.Ar path
must be a colon
.Pq Ql \&:
separated list of directories.
These directories will be searched before the standard directories or
the directories specified using the
.Fl M
option or the
.Ev MANPATH
environment variable.
.It Fl O Ar option Ns = Ns Ar value
Comma-separated output options.
For each output format, the available options are described in the
.Xr mandoc 1
manual.
.It Fl S Ar subsection
Restricts the directories that
.Nm
will search to those of a specific
.Xr machine 1
architecture.
.Ar subsection
is case insensitive.
.Pp
By default manual pages for all architectures are installed.
Therefore this option can be used to view pages for one
architecture whilst using another.
.Pp
This option overrides the
.Ev MACHINE
environment variable.
.It Oo Fl s Oc Ar section
Only select manuals from the specified
.Ar section .
The currently available sections are:
.Pp
.Bl -tag -width "localXXX" -offset indent -compact
.It 1
General commands
.Pq tools and utilities .
.It 2
System calls and error numbers.
.It 3
Library functions.
.It 3p
.Xr perl 1
programmer's reference guide.
.It 4
Device drivers.
.It 5
File formats.
.It 6
Games.
.It 7
Miscellaneous information.
.It 8
System maintenance and operation commands.
.It 9
Kernel internals.
.El
.It Fl T Ar output
Select the output format.
The default is
.Cm locale .
The other output modes
.Cm ascii ,
.Cm html ,
.Cm lint ,
.Cm man ,
.Cm pdf ,
.Cm ps ,
.Cm tree ,
and
.Cm utf8
are described in the
.Xr mandoc 1
manual.
.It Fl W Ar level
Specify the minimum message
.Ar level
to be reported on the standard error output and to affect the exit status.
The
.Ar level
can be
.Cm warning ,
.Cm error ,
or
.Cm unsupp ;
.Cm all
is an alias for
.Cm warning .
By default,
.Nm
is silent.
See the
.Xr mandoc 1
manual for details.
.It Fl w
List the pathnames of the manual pages which
.Nm
would display for the specified
.Ar section
and
.Ar name
combination.
.El
.Pp
Guidelines for writing
man pages can be found in
.Xr mdoc 7 .
.Pp
If both a formatted and an unformatted version of the same manual page,
for example
.Pa cat1/foo.0
and
.Pa man1/foo.1 ,
exist in the same directory, and at least one of them is selected,
only the newer one is used.
However, if both the
.Fl a
and the
.Fl w
options are specified, both file names are printed.
.Sh ENVIRONMENT
.Bl -tag -width MANPATHX
.It Ev MACHINE
As some manual pages are intended only for specific architectures,
.Nm
searches any subdirectories,
with the same name as the current architecture,
in every directory which it searches.
Machine specific areas are checked before general areas.
The current machine type may be overridden by setting the environment
variable
.Ev MACHINE
to the name of a specific architecture,
or with the
.Fl S
option.
.Ev MACHINE
is case insensitive.
.It Ev MANPAGER
Any non-empty value of the environment variable
.Ev MANPAGER
will be used instead of the standard pagination program,
.Xr more 1 .
If
.Xr less 1
is used, the interactive
.Ic :t
command can be used to go to the definitions of various terms, for
example command line options, command modifiers, internal commands,
environment variables, function names, preprocessor macros,
.Xr errno 2
values, and some other emphasized words.
Some terms may have defining text at more than one place.
In that case, the
.Xr less 1
interactive commands
.Ic t
and
.Ic T
can be used to move to the next and to the previous place providing
information about the term last searched for with
.Ic :t .
.It Ev MANPATH
The standard search path used by
.Nm
may be overridden by specifying a path in the
.Ev MANPATH
environment
variable.
The format of the path is a colon
.Pq Ql \&:
separated list of directories.
.It Ev PAGER
Specifies the pagination program to use when
.Ev MANPAGER
is not defined.
If neither PAGER nor MANPAGER is defined,
.Xr more 1
.Fl s
will be used.
.El
.Sh FILES
.Bl -tag -width /etc/man.conf -compact
.It Pa /etc/man.conf
default man configuration file
.El
.Sh EXIT STATUS
.Ex -std man
.Sh SEE ALSO
.Xr apropos 1 ,
.Xr intro 1 ,
.Xr whatis 1 ,
.Xr whereis 1 ,
.Xr intro 2 ,
.Xr intro 3 ,
.Xr intro 4 ,
.Xr intro 5 ,
.Xr man.conf 5 ,
.Xr intro 6 ,
.Xr intro 7 ,
.Xr mdoc 7 ,
.Xr intro 8 ,
.Xr intro 9
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.
.Pp
The flags
.Op Fl aCcfhIKlMmOSsTWw ,
as well as the environment variables
.Ev MACHINE ,
.Ev MANPAGER ,
and
.Ev MANPATH ,
are extensions to that specification.
.Sh HISTORY
A
.Nm
command first appeared in
.At v3 .
.Pp
The
.Fl w
option first appeared in
.At v7 ;
.Fl f
and
.Fl k
in
.Bx 4 ;
.Fl M
in
.Bx 4.3 ;
.Fl a
in
.Bx 4.3 Tahoe ;
.Fl c
and
.Fl m
in
.Bx 4.3 Reno ;
.Fl h
in
.Bx 4.3 Net/2 ;
.Fl C
in
.Nx 1.0 ;
.Fl s
and
.Fl S
in
.Ox 2.3 ;
and
.Fl I ,
.Fl K ,
.Fl l ,
.Fl O ,
and
.Fl W
in
.Ox 5.7 .
The
.Fl T
option first appeared in
.At III
and was also added in
.Ox 5.7 .