Ubuntu Manpage: man — display manual pages

NAME

     man — display manual pages

SYNOPSIS

     man [-acfhklw] [-C file] [-M path] [-m path] [-S subsection] [[-s] section] name ...

DESCRIPTION

The man utility displays the manual page entitled name. Pages may be selected according to
a specific category (section) or machine architecture (subsection).

The options are as follows:

-a Display all matching manual pages.

-C file
Use the specified file instead of the default configuration file. This permits
users to configure their own manual environment. See man.conf(5) for a description
of the contents of this file.

-c Copy the manual page to the standard output instead of using less(1) to paginate it.
This is done by default if the standard output is not a terminal device.

When using -c, most terminal devices are unable to show the markup. To print the
output of man to the terminal with markup but without using a pager, pipe it to
ul(1). To remove the markup, pipe the output to col(1) -b instead.

-f A synonym for whatis(1). It searches for name in manual page names and displays the
header lines from all matching pages. The search is case insensitive and matches
whole words only.

-h Display only the SYNOPSIS lines of the requested manual pages. Implies -a and -c.

-k A synonym for apropos(1). Instead of name, an expression can be provided using the
syntax described in the apropos(1) manual. By default, it displays the header lines
of all matching pages.

-l A synonym for mandoc(1). The name arguments are interpreted as filenames. No
search is done and file, path, section, subsection, and -w are ignored. This option
implies -a.

-M path
Override the list of directories to search for manual pages. The supplied path must
be a colon (‘:’) separated list of directories. This option also overrides the
environment variable MANPATH and any directories specified in the man.conf(5) file.

-m path
Augment the list of directories to search for manual pages. The supplied path must
be a colon (‘:’) separated list of directories. These directories will be searched
before those specified using the -M option, the MANPATH environment variable, the
man.conf(5) file, or the default directories.

-S subsection
Only show pages for the specified machine(1) architecture. subsection is case
insensitive.

By default manual pages for all architectures are installed. Therefore this option
can be used to view pages for one architecture whilst using another.

This option overrides the MACHINE environment variable.

[-s] section
Only select manuals from the specified section. The currently available sections
are:

1 General commands (tools and utilities).
2 System calls and error numbers.
3 Library functions.
3p perl(1) programmer's reference guide.
4 Device drivers.
5 File formats.
6 Games.
7 Miscellaneous information.
8 System maintenance and operation commands.
9 Kernel internals.

-w List the pathnames of all matching manual pages instead of displaying any of them.
If no name is given, list the directories that would be searched.

The options -IKOTW are also supported and are documented in mandoc(1). The options -fkl are
mutually exclusive and override each other.

The search starts with the -m argument if provided, then continues with the -M argument, the
MANPATH variable, the manpath entries in the man.conf(5) file, or with
/usr/share/man:/usr/X11R6/man:/usr/local/man by default. Within each of these, directories
are searched in the order provided. Within each directory, the search proceeds according to
the following list of sections: 1, 8, 6, 2, 3, 5, 7, 4, 9, 3p. The first match found is
shown.

The mandoc.db(5) database is used for looking up manual page entries. In cases where the
database is absent, outdated, or corrupt, man falls back to looking for files called
name.section. If both a formatted and an unformatted version of the same manual page, for
example cat1/foo.0 and man1/foo.1, exist in the same directory, only the unformatted version
is used. The database is kept up to date with makewhatis(8), which is run by the weekly(8)
maintenance script.

Guidelines for writing man pages can be found in mdoc(7).

ENVIRONMENT

MACHINE As some manual pages are intended only for specific architectures, man 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 MACHINE to the name of a specific architecture, or with the -S option.
MACHINE is case insensitive.

MANPAGER Any non-empty value of the environment variable MANPAGER is used instead of the
standard pagination program, less(1). If less(1) is used, the interactive :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, errno(2) values, and some other emphasized
words. Some terms may have defining text at more than one place. In that case,
the less(1) interactive commands t and T can be used to move to the next and to
the previous place providing information about the term last searched for with :t.
The -O tag[=term] option documented in the mandoc(1) manual opens a manual page at
the definition of a specific term rather than at the beginning.

MANPATH Override the standard search path which is either specified in man.conf(5) or the
default path. The format of MANPATH is a colon (‘:’) separated list of
directories. Invalid directories are ignored. Overridden by -M, ignored if -l is
specified.

If MANPATH begins with a colon, it is appended to the standard path; if it ends
with a colon, it is prepended to the standard path; or if it contains two adjacent
colons, the standard path is inserted between the colons.

PAGER Specifies the pagination program to use when MANPAGER is not defined. If neither
PAGER nor MANPAGER is defined, less(1) is used.

FILES

     /etc/man.conf  default man configuration file

EXIT STATUS

     The man utility exits 0 on success, and >0 if an error occurs.  See mandoc(1) for details.

EXAMPLES

     Format a page for pasting extracts into an email message — avoid printing any UTF-8
     characters, reduce the width to ease quoting in replies, and remove markup:

           $ man -T ascii -O width=65 pledge | col -b

     Read a typeset page in a PDF viewer:

           $ MANPAGER=mupdf man -T pdf lpd

STANDARDS

     The man utility is compliant with the IEEE Std 1003.1-2008 (“POSIX.1”) specification.

     The flags [-aCcfhIKlMmOSsTWw], as well as the environment variables MACHINE, MANPAGER, and
     MANPATH, are extensions to that specification.

HISTORY

     A man command first appeared in Version 2 AT&T UNIX.

     The -w option first appeared in Version 7 AT&T UNIX; -f and -k in 4BSD; -M in 4.3BSD; -a in
     4.3BSD-Tahoe; -c and -m in 4.3BSD-Reno; -h in 4.3BSD Net/2; -C in NetBSD 1.0; -s and -S in
     OpenBSD 2.3; and -I, -K, -l, -O, and -W in OpenBSD 5.7.  The -T option first appeared in
     AT&T System III UNIX and was also added in OpenBSD 5.7.