man(1) - phpMan

Command: man perldoc info search(apropos)  


MAN(1)                                  Manual pager utils                                 MAN(1)



NAME
       man - an interface to the on-line reference manuals

SYNOPSIS
       man  [-C  file]  [-d]  [-D]  [--warnings[=warnings]]  [-R  encoding]  [-L locale] [-m sys-
       tem[,...]] [-M path] [-S list] [-e extension] [-i|-I] [--regex|--wildcard]  [--names-only]
       [-a]  [-u]  [--no-subpages]  [-P  pager] [-r prompt] [-7] [-E encoding] [--no-hyphenation]
       [--no-justification] [-p string] [-t] [-T[device]] [-H[browser]] [-X[dpi]] [-Z] [[section]
       page ...] ...
       man -k [apropos options] regexp ...
       man -K [-w|-W] [-S list] [-i|-I] [--regex] [section] term ...
       man -f [whatis options] page ...
       man  -l  [-C  file] [-d] [-D] [--warnings[=warnings]] [-R encoding] [-L locale] [-P pager]
       [-r prompt] [-7] [-E encoding] [-p string] [-t] [-T[device]] [-H[browser]] [-X[dpi]]  [-Z]
       file ...
       man -w|-W [-C file] [-d] [-D] page ...
       man -c [-C file] [-d] [-D] page ...
       man [-?V]

DESCRIPTION
       man  is the system's manual pager. Each page argument given to man is normally the name of
       a program, utility or function.  The manual page associated with each of  these  arguments
       is  then found and displayed. A section, if provided, will direct man to look only in that
       section of the manual.  The default action is to search in all of the available  sections,
       following  a  pre-defined order and to show only the first page found, even if page exists
       in several sections.

       The table below shows the section numbers of the manual followed by  the  types  of  pages
       they contain.


       1   Executable programs or shell commands
       2   System calls (functions provided by the kernel)
       3   Library calls (functions within program libraries)
       4   Special files (usually found in /dev)
       5   File formats and conventions eg /etc/passwd
       6   Games
       7   Miscellaneous (including macro packages and conventions), e.g. man(7), groff(7)
       8   System administration commands (usually only for root)
       9   Kernel routines [Non standard]

       A manual page consists of several sections.

       Conventional  section  names  include NAME, SYNOPSIS, CONFIGURATION, DESCRIPTION, OPTIONS,
       EXIT STATUS, RETURN VALUE, ERRORS, ENVIRONMENT,  FILES,  VERSIONS,  CONFORMING TO,  NOTES,
       BUGS, EXAMPLE, AUTHORS, and SEE ALSO.

       The  following  conventions  apply  to  the SYNOPSIS section and can be used as a guide in
       other sections.


       bold text          type exactly as shown.
       italic text        replace with appropriate argument.
       [-abc]             any or all arguments within [ ] are optional.
       -a|-b              options delimited by | cannot be used together.
       argument ...       argument is repeatable.
       [expression] ...   entire expression within [ ] is repeatable.

       Exact rendering may vary depending on the output device.  For instance, man  will  usually
       not  be  able  to render italics when running in a terminal, and will typically use under-
       lined or coloured text instead.

       The command or function illustration is a pattern that should match all  possible  invoca-
       tions.   In  some  cases it is advisable to illustrate several exclusive invocations as is
       shown in the SYNOPSIS section of this manual page.

EXAMPLES
       man ls
           Display the manual page for the item (program) ls.

       man -a intro
           Display, in succession, all of the available intro manual pages contained  within  the
           manual.  It is possible to quit between successive displays or skip any of them.

       man -t alias | lpr -Pps
           Format  the  manual  page referenced by `alias', usually a shell manual page, into the
           default troff or groff format and pipe it to the printer named ps.  The default output
           for  groff  is  usually PostScript.  man --help should advise as to which processor is
           bound to the -t option.

       man -l -Tdvi ./foo.1x.gz > ./foo.1x.dvi
           This command will decompress and format the nroff source manual page ./foo.1x.gz  into
           a  device  independent (dvi) file.  The redirection is necessary as the -T flag causes
           output to be directed to stdout with no pager.  The output could be viewed with a pro-
           gram such as xdvi or further processed into PostScript using a program such as dvips.

       man -k printf
           Search  the short descriptions and manual page names for the keyword printf as regular
           expression.  Print out any matches.  Equivalent to apropos -r printf.

       man -f smail
           Lookup the manual pages referenced by smail and print out the  short  descriptions  of
           any found.  Equivalent to whatis -r smail.

OVERVIEW
       Many  options are available to man in order to give as much flexibility as possible to the
       user.  Changes can be made to the search path, section order, output processor, and  other
       behaviours and operations detailed below.

       If  set, various environment variables are interrogated to determine the operation of man.
       It is possible to set the `catch all' variable $MANOPT to any string in command line  for-
       mat  with  the  exception  that  any  spaces  used as part of an option's argument must be
       escaped (preceded by a backslash).  man will parse $MANOPT prior to parsing its  own  com-
       mand  line.   Those  options  requiring an argument will be overridden by the same options
       found on the command line.  To reset all of the options set in $MANOPT, -D can  be  speci-
       fied  as  the  initial  command  line  option.   This will allow man to `forget' about the
       options specified in $MANOPT although they must still have been valid.

       The manual pager utilities packaged as man-db make extensive use of index database caches.
       These  caches  contain  information  such  as  where  each manual page can be found on the
       filesystem and what its whatis (short one line description of the man page) contains,  and
       allow  man  to  run  faster  than if it had to search the filesystem each time to find the
       appropriate manual page.  If requested using the -u  option,  man  will  ensure  that  the
       caches  remain  consistent,  which can obviate the need to manually run software to update
       traditional whatis text databases.

       If man cannot find a mandb initiated index database for a particular manual  page  hierar-
       chy,  it  will still search for the requested manual pages, although file globbing will be
       necessary to search within that hierarchy.  If whatis or apropos fails to find an index it
       will try to extract information from a traditional whatis database instead.

       These  utilities  support compressed source nroff files having, by default, the extensions
       of .Z, .z and .gz.  It is possible to deal with any compression extension, but this infor-
       mation  must  be known at compile time.  Also, by default, any cat pages produced are com-
       pressed using gzip.  Each  `global'  manual  page  hierarchy  such  as  /usr/share/man  or
       /usr/X11R6/man  may  have  any directory as its cat page hierarchy.  Traditionally the cat
       pages are stored under the same hierarchy as the man pages, but for reasons such as  those
       specified  in the File Hierarchy Standard (FHS), it may be better to store them elsewhere.
       For details on how to do this, please read manpath(5).  For details on  why  to  do  this,
       read the standard.

       International  support  is  available with this package.  Native language manual pages are
       accessible (if available on your system) via use of locale functions.   To  activate  such
       support,  it  is  necessary  to set either $LC_MESSAGES, $LANG or another system dependent
       environment variable to your language locale, usually specified in the POSIX 1003.1  based
       format:

       <language>[_<territory>[.<character-set>[,<version>]]]

       If the desired page is available in your locale, it will be displayed in lieu of the stan-
       dard (usually American English) page.

       Support for international message catalogues is also featured in this package and  can  be
       activated in the same way, again if available.  If you find that the manual pages and mes-
       sage catalogues supplied with this package are not available in your native  language  and
       you would like to supply them, please contact the maintainer who will be coordinating such
       activity.

       For information regarding other features and extensions available with this manual  pager,
       please read the documents supplied with the package.

DEFAULTS
       man  will  search for the desired manual pages within the index database caches. If the -u
       option is given, a cache consistency check is performed to ensure the databases accurately
       reflect  the filesystem.  If this option is always given, it is not generally necessary to
       run mandb after the caches are initially created, unless a cache  becomes  corrupt.   How-
       ever, the cache consistency check can be slow on systems with many manual pages installed,
       so it is not performed by default, and system administrators may wish to run  mandb  every
       week  or  so  to keep the database caches fresh.  To forestall problems caused by outdated
       caches, man will fall back to file globbing if a cache lookup fails, just as it  would  if
       no cache was present.

       Once  a  manual page has been located, a check is performed to find out if a relative pre-
       formatted `cat' file already exists and is newer than the nroff file.  If it does and  is,
       this  preformatted  file is (usually) decompressed and then displayed, via use of a pager.
       The pager can be specified in a number of ways, or else will fall back  to  a  default  is
       used (see option -P for details).  If no cat is found or is older than the nroff file, the
       nroff is filtered through various programs and is shown immediately.

       If a cat file can be produced (a relative cat directory exists and has appropriate permis-
       sions), man will compress and store the cat file in the background.

       The  filters  are  deciphered by a number of means. Firstly, the command line option -p or
       the environment variable $MANROFFSEQ is interrogated. If -p was not used and the  environ-
       ment variable was not set, the initial line of the nroff file is parsed for a preprocessor
       string.  To contain a valid preprocessor string, the first line must resemble

       '\" <string>

       where string can be any combination of letters described by option -p below.

       If none of the above methods provide any filter information, a default set is used.

       A formatting pipeline is formed from the filters  and  the  primary  formatter  (nroff  or
       [tg]roff  with  -t)  and executed.  Alternatively, if an executable program mandb_nfmt (or
       mandb_tfmt with -t) exists in the man tree root, it is executed instead.  It  gets  passed
       the  manual source file, the preprocessor string, and optionally the device specified with
       -T or -E as arguments.

OPTIONS
       Non argument options that are duplicated either on the command line, in $MANOPT, or  both,
       are not harmful.  For options that require an argument, each duplication will override the
       previous argument value.

   General options
       -C file, --config-file=file
              Use this user configuration file rather than the default of ~/.manpath.

       -d, --debug
              Print debugging information.

       -D, --default
              This option is normally issued as the very first option and resets man's  behaviour
              to  its  default.   Its  use  is  to  reset those options that may have been set in
              $MANOPT.  Any options that follow -D will have their usual effect.

       --warnings[=warnings]
              Enable warnings from groff.  This may be used  to  perform  sanity  checks  on  the
              source  text of manual pages.  warnings is a comma-separated list of warning names;
              if it is not supplied, the default is "mac".  See the "Warnings" node in info groff
              for a list of available warning names.

   Main modes of operation
       -f, --whatis
              Equivalent  to whatis.  Display a short description from the manual page, if avail-
              able. See whatis(1) for details.

       -k, --apropos
              Equivalent to apropos.  Search the short manual page descriptions for keywords  and
              display any matches.  See apropos(1) for details.

       -K, --global-apropos
              Search  for  text in all manual pages.  This is a brute-force search, and is likely
              to take some time; if you can, you should specify a section to reduce the number of
              pages  that need to be searched.  Search terms may be simple strings (the default),
              or regular expressions if the --regex option is used.

       -l, --local-file
              Activate `local' mode.  Format and display local manual files instead of  searching
              through  the  system's manual collection.  Each manual page argument will be inter-
              preted as an nroff source file in the correct format.  No cat file is produced.  If
              '-'  is  listed as one of the arguments, input will be taken from stdin.  When this
              option is not used, and man fails to find the page required, before displaying  the
              error message, it attempts to act as if this option was supplied, using the name as
              a filename and looking for an exact match.

       -w, --where, --path, --location
              Don't actually display the manual pages, but do print the location(s) of the source
              nroff files that would be formatted.

       -W, --where-cat, --location-cat
              Don't  actually  display  the manual pages, but do print the location(s) of the cat
              files that would be displayed.  If -w and -W are both specified, print  both  sepa-
              rated by a space.

       -c, --catman
              This option is not for general use and should only be used by the catman program.

       -R encoding, --recode=encoding
              Instead of formatting the manual page in the usual way, output its source converted
              to the specified encoding.  If you already know the encoding of  the  source  file,
              you  can  also use manconv(1) directly.  However, this option allows you to convert
              several manual pages to a single encoding without having to  explicitly  state  the
              encoding  of each, provided that they were already installed in a structure similar
              to a manual page hierarchy.

   Finding manual pages
       -L locale, --locale=locale
              man will normally determine your current locale by a call to the C function  setlo-
              cale(3)  which  interrogates  various  environment  variables,  possibly  including
              $LC_MESSAGES and $LANG.  To temporarily override the  determined  value,  use  this
              option  to  supply  a  locale  string  directly to man.  Note that it will not take
              effect until the search for pages actually begins.  Output such as the help message
              will always be displayed in the initially determined locale.

       -m system[,...], --systems=system[,...]
              If  this  system  has  access to other operating system's manual pages, they can be
              accessed using this option.  To search for a manual page from NewOS's  manual  page
              collection, use the option -m NewOS.

              The  system  specified  can  be  a  combination of comma delimited operating system
              names.  To include a search of the native operating system's manual pages,  include
              the  system name man in the argument string.  This option will override the $SYSTEM
              environment variable.

       -M path, --manpath=path
              Specify an alternate manpath to use.  By default, man uses manpath derived code  to
              determine the path to search.  This option overrides the $MANPATH environment vari-
              able and causes option -m to be ignored.

              A path specified as a manpath must be the root of a manual  page  hierarchy  struc-
              tured  into sections as described in the man-db manual (under "The manual page sys-
              tem").  To view manual pages outside such hierarchies, see the -l option.

       -S list, -s list, --sections=list
              List is a colon- or comma-separated list of `order  specific'  manual  sections  to
              search.  This option overrides the $MANSECT environment variable.  (The -s spelling
              is for compatibility with System V.)

       -e sub-extension, --extension=sub-extension
              Some systems incorporate large packages of manual pages, such as those that  accom-
              pany the Tcl package, into the main manual page hierarchy.  To get around the prob-
              lem of having two manual pages with the same name such as exit(3),  the  Tcl  pages
              were usually all assigned to section l.  As this is unfortunate, it is now possible
              to put the pages in the correct section, and to assign a  specific  `extension'  to
              them,  in  this case, exit(3tcl).  Under normal operation, man will display exit(3)
              in preference to exit(3tcl).  To negotiate this situation and to  avoid  having  to
              know  which section the page you require resides in, it is now possible to give man
              a sub-extension string indicating which package the page must belong to.  Using the
              above example, supplying the option -e tcl to man will restrict the search to pages
              having an extension of *tcl.

       -i, --ignore-case
              Ignore case when searching for manual pages.  This is the default.

       -I, --match-case
              Search for manual pages case-sensitively.

       --regex
              Show all pages with any part of either their names or their  descriptions  matching
              each  page  argument  as  a regular expression, as with apropos(1).  Since there is
              usually no reasonable way to pick a  "best"  page  when  searching  for  a  regular
              expression, this option implies -a.

       --wildcard
              Show  all  pages with any part of either their names or their descriptions matching
              each page argument using shell-style wildcards, as with apropos(1) --wildcard.  The
              page  argument  must  match the entire name or description, or match on word bound-
              aries in the description.  Since there is usually  no  reasonable  way  to  pick  a
              "best" page when searching for a wildcard, this option implies -a.

       --names-only
              If  the  --regex  or  --wildcard  option  is  used, match only page names, not page
              descriptions, as with whatis(1).  Otherwise, no effect.

       -a, --all
              By default, man will exit after displaying the most suitable manual page it  finds.
              Using  this option forces man to display all the manual pages with names that match
              the search criteria.

       -u, --update
              This option causes man to perform an `inode level' consistency check on  its  data-
              base  caches  to ensure that they are an accurate representation of the filesystem.
              It will only have a useful effect if man is installed with the setuid bit set.

       --no-subpages
              By default, man will try to interpret pairs of manual page names given on the  com-
              mand  line  as  equivalent  to  a single manual page name containing a hyphen or an
              underscore.  This supports the common pattern of programs that implement  a  number
              of subcommands, allowing them to provide manual pages for each that can be accessed
              using similar syntax as would be used to invoke the  subcommands  themselves.   For
              example:

                $ man -aw git diff
                /usr/share/man/man1/git-diff.1.gz

              To disable this behaviour, use the --no-subpages option.

                $ man -aw --no-subpages git diff
                /usr/share/man/man1/git.1.gz
                /usr/share/man/man3/Git.3pm.gz
                /usr/share/man/man1/diff.1.gz

   Controlling formatted output
       -P pager, --pager=pager
              Specify  which  output  pager  to  use.  By default, man uses less -s.  This option
              overrides the $MANPAGER environment variable, which in turn  overrides  the  $PAGER
              environment variable.  It is not used in conjunction with -f or -k.

              The  value  may  be  a simple command name or a command with arguments, and may use
              shell quoting (backslashes, single quotes, or double quotes).  It may not use pipes
              to  connect  multiple  commands;  if you need that, use a wrapper script, which may
              take the file to display either as an argument or on standard input.

       -r prompt, --prompt=prompt
              If a recent version of less is used as the pager,  man  will  attempt  to  set  its
              prompt and some sensible options.  The default prompt looks like

               Manual page name(sec) line x

              where name denotes the manual page name, sec denotes the section it was found under
              and x the current line number.  This is achieved by  using  the  $LESS  environment
              variable.

              Supplying  -r with a string will override this default.  The string may contain the
              text $MAN_PN which will be expanded to the name of the current manual page and  its
              section  name  surrounded  by  `(' and `)'.  The string used to produce the default
              could be expressed as

              \ Manual\ page\ \$MAN_PN\ ?ltline\ %lt?L/%L.:
              byte\ %bB?s/%s..?\ (END):?pB\ %pB\\%..
              (press h for help or q to quit)

              It is broken into three lines here for the sake of readability only.  For its mean-
              ing  see  the  less(1)  manual  page.   The prompt string is first evaluated by the
              shell.  All double quotes, back-quotes  and  backslashes  in  the  prompt  must  be
              escaped  by a preceding backslash.  The prompt string may end in an escaped $ which
              may be followed by further options for less.  By default man sets the -ix8 options.

              If you want to override man's prompt string processing completely, use the $MANLESS
              environment variable described below.

       -7, --ascii
              When  viewing a pure ascii(7) manual page on a 7 bit terminal or terminal emulator,
              some characters may not display correctly when using the latin1(7) device  descrip-
              tion with GNU nroff.  This option allows pure ascii manual pages to be displayed in
              ascii with the latin1 device.  It will not translate any latin1 text.  The  follow-
              ing  table shows the translations performed: some parts of it may only be displayed
              properly when using GNU nroff's latin1(7) device.


              Description           Octal   latin1   ascii
              ---------------------------------------------
              continuation hyphen    255      -        -
              bullet (middle dot)    267      o        o
              acute accent           264      '        '
              multiplication sign    327      x        x

              If the latin1 column displays correctly, your terminal may be  set  up  for  latin1
              characters  and  this option is not necessary.  If the latin1 and ascii columns are
              identical, you are reading this page using this option or man did not  format  this
              page  using the latin1 device description.  If the latin1 column is missing or cor-
              rupt, you may need to view manual pages with this option.

              This option is ignored when using options -t, -H, -T, or -Z and may be useless  for
              nroff other than GNU's.

       -E encoding, --encoding=encoding
              Generate output for a character encoding other than the default.  For backward com-
              patibility, encoding may be an nroff device such as ascii, latin1, or utf8 as  well
              as a true character encoding such as UTF-8.

       --no-hyphenation, --nh
              Normally, nroff will automatically hyphenate text at line breaks even in words that
              do not contain hyphens, if it is necessary to do so to lay  out  words  on  a  line
              without  excessive  spacing.   This option disables automatic hyphenation, so words
              will only be hyphenated if they already contain hyphens.

              If you are writing a manual page and simply want to prevent nroff from  hyphenating
              a  word  at  an  inappropriate point, do not use this option, but consult the nroff
              documentation instead; for instance, you can put "\%" inside  a  word  to  indicate
              that it may be hyphenated at that point, or put "\%" at the start of a word to pre-
              vent it from being hyphenated.

       --no-justification, --nj
              Normally, nroff will automatically justify text to both margins.  This option  dis-
              ables  full  justification,  leaving  justified  only to the left margin, sometimes
              called "ragged-right" text.

              If you are writing a manual page and simply want to prevent nroff  from  justifying
              certain  paragraphs,  do  not  use this option, but consult the nroff documentation
              instead; for instance, you can use the ".na", ".nf", ".fi", and ".ad"  requests  to
              temporarily disable adjusting and filling.

       -p string, --preprocessor=string
              Specify  the sequence of preprocessors to run before nroff or troff/groff.  Not all
              installations will have a full set of preprocessors.  Some of the preprocessors and
              the letters used to designate them are: eqn (e), grap (g), pic (p), tbl (t), vgrind
              (v), refer (r).  This option overrides the $MANROFFSEQ environment variable.  zsoe-
              lim is always run as the very first preprocessor.

       -t, --troff
              Use groff -mandoc to format the manual page to stdout.  This option is not required
              in conjunction with -H, -T, or -Z.

       -T[device], --troff-device[=device]
              This option is used to change groff (or possibly troff's) output to be suitable for
              a  device  other  than  the  default.   It  implies  -t.   Examples  (provided with
              Groff-1.17) include dvi, latin1, ps, utf8, X75 and X100.

       -H[browser], --html[=browser]
              This option will cause groff to produce HTML output, and will display  that  output
              in  a  web  browser.   The  choice of browser is determined by the optional browser
              argument if one is provided, by the $BROWSER environment variable, or by a compile-
              time  default  if  that  is unset (usually lynx).  This option implies -t, and will
              only work with GNU troff.

       -X[dpi], --gxditview[=dpi]
              This option displays the output of groff in a graphical window using the  gxditview
              program.   The  dpi (dots per inch) may be 75, 75-12, 100, or 100-12, defaulting to
              75; the -12 variants use a 12-point base font.  This option  implies  -T  with  the
              X75, X75-12, X100, or X100-12 device respectively.

       -Z, --ditroff
              groff  will  run troff and then use an appropriate post-processor to produce output
              suitable for the chosen device.  If groff -mandoc is groff, this option  is  passed
              to groff and will suppress the use of a post-processor.  It implies -t.

   Getting help
       -?, --help
              Print a help message and exit.

       --usage
              Print a short usage message and exit.

       -V, --version
              Display version information.

EXIT STATUS
       0      Successful program execution.

       1      Usage, syntax or configuration file error.

       2      Operational error.

       3      A child process returned a non-zero exit status.

       16     At least one of the pages/files/keywords didn't exist or wasn't matched.

ENVIRONMENT
       MANPATH
              If $MANPATH is set, its value is used as the path to search for manual pages.

       MANROFFOPT
              The  contents  of  $MANROFFOPT are added to the command line every time man invokes
              the formatter (nroff, troff, or groff).

       MANROFFSEQ
              If $MANROFFSEQ is set, its value is used to determine the set of  preprocessors  to
              pass each manual page through.  The default preprocessor list is system dependent.

       MANSECT
              If  $MANSECT is set, its value is a colon-delimited list of sections and it is used
              to determine which manual sections to search and in what order.

       MANPAGER, PAGER
              If $MANPAGER or $PAGER is set ($MANPAGER is used in preference), its value is  used
              as the name of the program used to display the manual page.  By default, less -s is
              used.

              The value may be a simple command name or a command with  arguments,  and  may  use
              shell quoting (backslashes, single quotes, or double quotes).  It may not use pipes
              to connect multiple commands; if you need that, use a  wrapper  script,  which  may
              take the file to display either as an argument or on standard input.

       MANLESS
              If  $MANLESS  is  set, man will not perform any of its usual processing to set up a
              prompt string for the less pager.  Instead, the value of $MANLESS  will  be  copied
              verbatim  into  $LESS.   For example, if you want to set the prompt string uncondi-
              tionally to "my prompt string", set $MANLESS to `-Psmy prompt string'.

       BROWSER
              If $BROWSER is set, its value is a colon-delimited list of commands, each of  which
              in  turn is used to try to start a web browser for man --html.  In each command, %s
              is replaced by a filename containing the HTML output from groff, %% is replaced  by
              a single percent sign (%), and %c is replaced by a colon (:).

       SYSTEM If  $SYSTEM is set, it will have the same effect as if it had been specified as the
              argument to the -m option.

       MANOPT If $MANOPT is set, it will be parsed prior to man's command line and is expected to
              be in a similar format.  As all of the other man specific environment variables can
              be expressed as command line options, and are thus candidates for being included in
              $MANOPT it is expected that they will become obsolete.  N.B. All spaces that should
              be interpreted as part of an option's argument must be escaped.

       MANWIDTH
              If $MANWIDTH is set, its value is used as the line length for  which  manual  pages
              should  be formatted.  If it is not set, manual pages will be formatted with a line
              length appropriate to the current terminal (using an  ioctl(2)  if  available,  the
              value  of $COLUMNS, or falling back to 80 characters if neither is available).  Cat
              pages will only be saved when the default formatting can be used, that is when  the
              terminal line length is between 66 and 80 characters.

       MAN_KEEP_FORMATTING
              Normally,  when  output is not being directed to a terminal (such as to a file or a
              pipe), formatting characters are discarded to make it easier  to  read  the  result
              without  special  tools.   However, if $MAN_KEEP_FORMATTING is set to any non-empty
              value, these formatting characters are retained.  This may be useful  for  wrappers
              around man that can interpret formatting characters.

       MAN_KEEP_STDERR
              Normally,  when  output  is  being directed to a terminal (usually to a pager), any
              error output from the command used to produce formatted versions of manual pages is
              discarded  to  avoid  interfering with the pager's display.  Programs such as groff
              often produce relatively minor error messages about typographical problems such  as
              poor  alignment,  which  are unsightly and generally confusing when displayed along
              with the manual page.  However,  some  users  want  to  see  them  anyway,  so,  if
              $MAN_KEEP_STDERR  is  set to any non-empty value, error output will be displayed as
              usual.

       LANG, LC_MESSAGES
              Depending on system and implementation, either or both of  $LANG  and  $LC_MESSAGES
              will be interrogated for the current message locale.  man will display its messages
              in that locale (if available).  See setlocale(3) for precise details.

FILES
       /etc/man_db.conf
              man-db configuration file.

       /usr/share/man
              A global manual page hierarchy.

       /usr/share/man/index.(bt|db|dir|pag)
              A traditional global index database cache.

       /var/cache/man/index.(bt|db|dir|pag)
              An FHS compliant global index database cache.

SEE ALSO
       apropos(1), groff(1), less(1), manpath(1), nroff(1), troff(1), whatis(1), zsoelim(1), set-
       locale(3),  manpath(5), ascii(7), latin1(7), man(7), catman(8), mandb(8), the man-db pack-
       age manual, FSSTND

HISTORY
       1990, 1991 - Originally written by John W. Eaton (jwe AT che.edu).

       Dec 23 1992: Rik Faith (faith AT cs.edu) applied bug fixes  supplied  by  Willem  Kasdorp
       (wkasdo AT nikhefk.nl).

       30th  April 1994 - 23rd February 2000: Wilf. (G.Wilford AT ee.uk) has been develop-
       ing and maintaining this package with the help of a few dedicated people.

       30th October 1996 - 30th March 2001: Fabrizio Polacco <fpolacco AT debian.org> maintained and
       enhanced this package for the Debian project, with the help of all the community.

       31st  March  2001  - present day: Colin Watson <cjwatson AT debian.org> is now developing and
       maintaining man-db.



2.6.3                                       2012-09-17                                     MAN(1)

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