.\"-
.\"  Copyright (c) 2010 Gordon Tetlow
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.\" $FreeBSD$
.\"
.Dd September 1, 2010
.Dt MAN 1
.Os
.Sh NAME
.Nm man
.Nd display online manual documentation pages
.Sh SYNOPSIS
.Nm
.Op Fl adho
.Op Fl t | Fl w
.Op Fl M Ar manpath
.Op Fl P Ar pager
.Op Fl S Ar mansect
.Op Fl m Ar arch Ns Op : Ns Ar machine
.Op Fl p Op Ar eprtv
.Op Ar mansect
.Ar page ...
.Nm
.Fl f
.Ar keyword ...
.Nm
.Fl k
.Ar keyword ...
.Sh DESCRIPTION
The
.Nm
utility finds and displays online manual documentation pages.
If
.Ar mansect
is provided,
.Nm
restricts the search to the specific section of the manual.
.Pp
Options that
.Nm
understands:
.Bl -tag -width indent
.It Fl M Ar manpath
Forces a specific colon separated manual path instead of the default
search path.
See
.Xr manpath 1 .
Overrides the
.Ev MANPATH
environment variable.
.It Fl P Ar pager
Use specified pager.
Defaults to
.Ic "more -s" .
Overrides the
.Ev PAGER
environment variable.
.It Fl S Ar mansect
Restricts manual sections searched to the specified colon delimited list.
Defaults to
.Va 1:1aout:8:2:3:n:4:5:6:7:9:l .
Overrides the
.Ev MANSECT
environment variable.
.It Fl a
Display all manual pages instead of just the first found for each
.Ar page
argument.
.It Fl d
Print extra debugging information.
Repeat for increased verbosity.
Does not display the manual page.
.It Fl f
Emulate
.Xr whatis 1 .
.It Fl h
Display short help message and exit.
.It Fl k
Emulate
.Xr apropos 1 .
.It Fl m Ar arch Ns Op : Ns Ar machine
Override the default architecture and machine settings allowing lookup of
other platform specific manual pages.
See
.Sx IMPLEMENTATION NOTES
for how this option changes the default behavior.
Overrides the
.Ev MACHINE_ARCH
and
.Ev MACHINE
environment variables.
.It Fl o
Force use of non-localized manual pages.
See
.Sx IMPLEMENTATION NOTES
for how locale specific searches work.
Overrides the
.Ev LC_ALL , LC_CTYPE ,
and
.Ev LANG
environment variables.
.It Fl p Op Ar eprtv
Use the list of given preprocessors before running
.Xr nroff 1
or
.Xr troff 1 .
Valid preprocessors arguments:
.Bl -tag -width indent -compact
.It Cm e
.Xr eqn 1
.It Cm p
.Xr pic 1
.It Cm r
.Xr refer 1
.It Cm t
.Xr tbl 1
.It Cm v
.Xr vgrind 1
.El
Overrides the
.Ev MANROFFSEQ
environment variable.
.It Fl t
Send manual page source through
.Xr troff 1
allowing transformation of the manual pages to other formats.
.It Fl w
Display the location of the manual page instead of the contents of
the manual page.
.El
.Sh IMPLEMENTATION NOTES
.Ss Locale Specific Searches
The
.Nm
utility supports manual pages in different locales.
The search behavior is dictated by the first of three
environment variables with a nonempty string:
.Ev LC_ALL ,
.Ev LC_CTYPE ,
or
.Ev LANG .
If set,
.Nm
will search for locale specific manual pages using the following logic:
.Bl -item -compact -offset indent
.Sm off
.It
.Va lang _
.Va country .
.Va charset
.It
.Va lang .
.Va charset
.It
.Li en .
.Va charset
.Sm on
.El
For example, if
.Ev LC_ALL
is set to
.Va ja_JP.eucJP ,
.Nm
will search the following paths when considering section 1 manual pages in
.Pa /usr/share/man :
.Bl -item -compact -offset indent
.It
.Pa /usr/share/man/ja_JP.eucJP/man1
.It
.Pa /usr/share/man/ja.eucJP/man1
.It
.Pa /usr/share/man/en.eucJP/man1
.It
.Pa /usr/share/man/man1
.El
.Ss Platform Specific Searches
The
.Nm
utility supports platform specific manual pages.
The search behavior is dictated by the
.Fl m
option or the
.Ev MACHINE_ARCH
and
.Ev MACHINE
environment variables.
For example, if
.Ev MACHINE_ARCH
is set to
.Va i386
and
.Ev MACHINE
is set to
.Va pc98 ,
.Nm
will search the following paths when considering section 4 manual pages in
.Pa /usr/share/man :
.Bl -item -compact -offset indent
.It
.Pa /usr/share/man/man4/pc98
.It
.Pa /usr/share/man/man4/i386
.It
.Pa /usr/share/man/man4
.El
.Sh ENVIRONMENT
The following environment variables affect the execution of
.Nm :
.Bl -tag -width ".Ev MANPATH"
.It Ev LC_ALL , LC_CTYPE , LANG
Used to find locale specific manual pages.
Valid values can be found by running the
.Xr locale 1
command.
See
.Sx IMPLEMENTATION NOTES
for details.
Influenced by the
.Fl o
option.
.It Ev MACHINE_ARCH , MACHINE
Used to find platform specific manual pages.
If unset, the output of
.Ic "sysctl hw.machine_arch"
and
.Ic "sysctl hw.machine"
is used respectively.
See
.Sx IMPLEMENTATION NOTES
for details.
Corresponds to the
.Fl m
option.
.It Ev MANPATH
Used to find the location of the manual files.
See
.Xr manpath 1
for additional information.
Corresponds to the
.Fl M
option.
.It Ev MANROFFSEQ
Used to determine the preprocessors for the manual source before running
.Xr nroff 1
or
.Xr troff 1 .
If unset, defaults to
.Xr tbl 1 .
Corresponds to the
.Fl p
option.
.It Ev MANSECT
Restricts manual sections searched to the specified colon delimited list.
Corresponds to the
.Fl S
option.
.It Ev PAGER
Program used to display files.
If unset,
.Ic "more -s"
is used.
.El
.Sh FILES
.Bl -tag -width indent -compact
.It Pa /etc/man.conf
System configuration file.
.It Pa /usr/local/etc/man.d/*.conf
Local configuration files.
.El
.Sh SEE ALSO
.Xr apropos 1 ,
.Xr locale 1 ,
.Xr manpath 1 ,
.Xr man.conf 5 ,
.Xr nroff 1 ,
.Xr troff 1 ,
.Xr whatis 1