man(1) man(1)
NAME
man - format and display the on-line manual pages
SYNOPSIS
man [-acdfFhkKtwW] [--path] [-m system] [-p string] [-C config_file] [-M pathlist] [-P pager] [-B
browser] [-H htmlpager] [-S section_list] [section] name ...
DESCRIPTION
man formats and displays the on-line manual pages. If you specify section, man only looks in that
section of the manual. name is normally the name of the manual page, which is typically the name of
a command, function, or file. However, if name contains a slash (/) then man interprets it as a file
specification, so that you can do man ./foo.5 or even man /cd/foo/bar.1.gz.
See below for a description of where man looks for the manual page files.
OPTIONS
-C config_file
Specify the configuration file to use; the default is /private/etc/man.conf. (See
man.conf(5).)
-M path
Specify the list of directories to search for man pages. Separate the directories with
colons. An empty list is the same as not specifying -M at all. See SEARCH PATH FOR MANUAL
PAGES.
-P pager
Specify which pager to use. This option overrides the MANPAGER environment variable, which in
turn overrides the PAGER variable. By default, man uses /usr/bin/less -is.
-B Specify which browser to use on HTML files. This option overrides the BROWSER environment
variable. By default, man uses /usr/bin/less-is,
-H Specify a command that renders HTML files as text. This option overrides the HTMLPAGER envi-ronment environment
ronment variable. By default, man uses /bin/cat,
-S section_list
List is a colon separated list of manual sections to search. This option overrides the MAN-SECT MANSECT
SECT environment variable.
-a By default, man will exit after displaying the first manual page it finds. Using this option
forces man to display all the manual pages that match name, not just the first.
-c Reformat the source man page, even when an up-to-date cat page exists. This can be meaningful
if the cat page was formatted for a screen with a different number of columns, or if the pre-formatted preformatted
formatted page is corrupted.
-d Don't actually display the man pages, but do print gobs of debugging information.
-D Both display and print debugging info.
-f Equivalent to whatis.
-F or --preformat
Format only - do not display.
-h Print a help message and exit.
-k Equivalent to apropos.
-K Search for the specified string in *all* man pages. Warning: this is probably very slow! It
helps to specify a section. (Just to give a rough idea, on my machine this takes about a
minute per 500 man pages.)
-m system
Specify an alternate set of man pages to search based on the system name given.
-p string
Specify the sequence of preprocessors to run before nroff or troff. Not all installations
will have a full set of preprocessors. Some of the preprocessors and the letters used to des-ignate designate
ignate them are: eqn (e), grap (g), pic (p), tbl (t), vgrind (v), refer (r). This option
overrides the MANROFFSEQ environment variable.
-t Use /usr/bin/groff -Tps -mandoc -c to format the manual page, passing the output to stdout.
The default output format of /usr/bin/groff -Tps -mandoc -c is Postscript, refer to the manual
page of /usr/bin/groff -Tps -mandoc -c for ways to pick an alternate format.
Depending on the selected format and the availability of printing devices, the output may need to be
passed through some filter or another before being printed.
-w or --path
Don't actually display the man pages, but do print the location(s) of the files that would be
formatted or displayed. If no argument is given: display (on stdout) the list of directories
that is searched by man for man pages. If manpath is a link to man, then "manpath" is equiva-lent equivalent
lent to "man --path".
-W Like -w, but print file names one per line, without additional information. This is useful in
shell commands like man -aW man | xargs ls -l
CAT PAGES
Man will try to save the formatted man pages, in order to save formatting time the next time these
pages are needed. Traditionally, formatted versions of pages in DIR/manX are saved in DIR/catX, but
other mappings from man dir to cat dir can be specified in /private/etc/man.conf. No cat pages are
saved when the required cat directory does not exist. No cat pages are saved when they are formatted
for a line length different from 80. No cat pages are saved when man.conf contains the line NOCACHE.
It is possible to make man suid to a user man. Then, if a cat directory has owner man and mode 0755
(only writable by man), and the cat files have owner man and mode 0644 or 0444 (only writable by man,
or not writable at all), no ordinary user can change the cat pages or put other files in the cat
directory. If man is not made suid, then a cat directory should have mode 0777 if all users should be
able to leave cat pages there.
The option -c forces reformatting a page, even if a recent cat page exists.
HTML PAGES
Man will find HTML pages if they live in directories named as expected to be ".html", thus a valid
name for an HTML version of the ls(1) man page would be /usr/share/man/htmlman1/ls.1.html.
SEARCH PATH FOR MANUAL PAGES
man uses a sophisticated method of finding manual page files, based on the invocation options and
environment variables, the /private/etc/man.conf configuration file, and some built in conventions
and heuristics.
First of all, when the name argument to man contains a slash (/), man assumes it is a file specifica-tion specification
tion itself, and there is no searching involved.
But in the normal case where name doesn't contain a slash, man searches a variety of directories for
a file that could be a manual page for the topic named.
If you specify the -M pathlist option, pathlist is a colon-separated list of the directories that man
searches.
If you don't specify -M but set the MANPATH environment variable, the value of that variable is the
list of the directories that man searches.
If you don't specify an explicit path list with -M or MANPATH, man develops its own path list based
on the contents of the configuration file /private/etc/man.conf. The MANPATH statements in the con-figuration configuration
figuration file identify particular directories to include in the search path.
Furthermore, the MANPATH_MAP statements add to the search path depending on your command search path
(i.e. your PATH environment variable). For each directory that may be in the command search path, a
MANPATH_MAP statement specifies a directory that should be added to the search path for manual page
files. man looks at the PATH variable and adds the corresponding directories to the manual page file
search path. Thus, with the proper use of MANPATH_MAP, when you issue the command man xyz, you get a
manual page for the program that would run if you issued the command xyz.
In addition, for each directory in the command search path (we'll call it a "command directory") for
which you do not have a MANPATH_MAP statement, man automatically looks for a manual page directory
"nearby" namely as a subdirectory in the command directory itself or in the parent directory of the
command directory.
You can disable the automatic "nearby" searches by including a NOAUTOPATH statement in /pri-vate/etc/man.conf. /private/etc/man.conf.
vate/etc/man.conf.
In each directory in the search path as described above, man searches for a file named topic.section,
with an optional suffix on the section number and possibly a compression suffix. If it doesn't find
such a file, it then looks in any subdirectories named manN or catN where N is the manual section
number. If the file is in a catN subdirectory, man assumes it is a formatted manual page file (cat
page). Otherwise, man assumes it is unformatted. In either case, if the filename has a known com-pression compression
pression suffix (like .gz), man assumes it is gzipped.
If you want to see where (or if) man would find the manual page for a particular topic, use the
--path (-w) option.
ENVIRONMENT
MANPATH
If MANPATH is set, man uses it as the path to search for manual page files. It overrides the
configuration file and the automatic search path, but is overridden by the -M invocation
option. See SEARCH PATH FOR MANUAL PAGES.
MANPL If MANPL is set, its value is used as the display page length. Otherwise, the entire man page
will occupy one (long) page.
MANROFFSEQ
If MANROFFSEQ is set, its value is used to determine the set of preprocessors run before run-ning running
ning nroff or troff. By default, pages are passed through the tbl preprocessor before nroff.
MANSECT
If MANSECT is set, its value is used to determine which manual sections to search.
MANWIDTH
If MANWIDTH is set, its value is used as the width manpages should be displayed. Otherwise
the pages may be displayed over the whole width of your screen.
MANPAGER
If MANPAGER is set, its value is used as the name of the program to use to display the man
page. If not, then PAGER is used. If that has no value either, /usr/bin/less -is is used.
BROWSER
The name of a browser to use for displaying HTML manual pages. If it is not set,
/usr/bin/less -is is used.
HTMLPAGER
The command to use for rendering HTML manual pages as text. If it is not set, /bin/cat is
used.
LANG If LANG is set, its value defines the name of the subdirectory where man first looks for man
pages. Thus, the command `LANG=dk man 1 foo' will cause man to look for the foo man page in
.../dk/man1/foo.1, and if it cannot find such a file, then in .../man1/foo.1, where ... is a
directory on the search path.
NLSPATH, LC_MESSAGES, LANG
The environment variables NLSPATH and LC_MESSAGES (or LANG when the latter does not exist)
play a role in locating the message catalog. (But the English messages are compiled in, and
for English no catalog is required.) Note that programs like col(1) called by man also use
e.g. LC_CTYPE.
PATH PATH helps determine the search path for manual page files. See SEARCH PATH FOR MANUAL PAGES.
SYSTEM SYSTEM is used to get the default alternate system name (for use with the -m option).
BUGS
The -t option only works if a troff-like program is installed.
If you see blinking \255 or <AD> instead of hyphens, put `LESSCHARSET=latin1' in your environment.
TIPS
If you add the line
(global-set-key [(f1)] (lambda () (interactive) (manual-entry (current-word))))
to your .emacs file, then hitting F1 will give you the man page for the library call at the current
cursor position.
To get a plain text version of a man page, without backspaces and underscores, try
# man foo | col -b > foo.mantxt
AUTHOR
John W. Eaton was the original author of man. Zeyd M. Ben-Halim released man 1.2, and Andries
Brouwer followed up with versions 1.3 thru 1.5p. Federico Lucifredi <flucifredi@acm.org> is the cur-rent current
rent maintainer.
SEE ALSO
apropos(1), whatis(1), less(1), groff(1), man.conf(5).
September 19, 2005 man(1)
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