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whatis(1) - phpMan

Command: man perldoc info search(apropos)  

WHATIS(1)                               Manual pager utils                              WHATIS(1)

       whatis - display one-line manual page descriptions

       whatis  [-dlv?V]  [-r|-w] [-s list] [-m system[,...]] [-M path] [-L locale] [-C file] name

       Each manual page has a short description available within it.  whatis searches the  manual
       page names and displays the manual page descriptions of any name matched.

       name  may contain wildcards (-w) or be a regular expression (-r).  Using these options, it
       may be necessary to quote the name or escape (\) the special characters to stop the  shell
       from interpreting them.

       index databases are used during the search, and are updated by the mandb program.  Depend‐
       ing on your installation, this may be run by a periodic cron job, or may need  to  be  run
       manually  after new manual pages have been installed.  To produce an old style text whatis
       database from the relative index database, issue the command:

       whatis -M manpath -w '*' | sort > manpath/whatis

       where manpath is a manual page hierarchy such as /usr/man.

       -d, --debug
              Print debugging information.

       -v, --verbose
              Print verbose warning messages.

       -r, --regex
              Interpret each name as a regular expression.  If a name matches any part of a  page
              name, a match will be made.  This option causes whatis to be somewhat slower due to
              the nature of database searches.

       -w, --wildcard
              Interpret each name as a pattern containing shell style wildcards.  For a match  to
              be  made,  an  expanded  name  must match the entire page name.  This option causes
              whatis to be somewhat slower due to the nature of database searches.

       -l, --long
              Do not trim output to the terminal width.  Normally, output will  be  truncated  to
              the terminal width to avoid ugly results from poorly-written NAME sections.

       -s list, --sections list, --section list
              Search only the given manual sections.  list is a colon- or comma-separated list of
              sections.  If an entry in list is a simple section, for example "3", then the  dis‐
              played  list of descriptions will include pages in sections "3", "3perl", "3x", and
              so on; while if an entry in list has an extension, for example  "3perl",  then  the
              list will only include pages in that exact part of the manual section.

       -m system[,...], --systems=system[,...]
              If  this  system has access to other operating system's manual page names, they can
              be accessed using this option.  To search NewOS's manual page names, 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  page  names,
              include  the system name man in the argument string.  This option will override the
              $SYSTEM environment variable.

       -M path, --manpath=path
              Specify an alternate set of colon-delimited manual page hierarchies to search.   By
              default,  whatis  uses  the  $MANPATH  environment  variable, unless it is empty or
              unset, in which case it will determine an appropriate manpath based on  your  $PATH
              environment variable.  This option overrides the contents of $MANPATH.

       -L locale, --locale=locale
              whatis will normally determine your current locale by a call to the C function set‐
              locale(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 whatis.  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.

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

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

              Print a short usage message and exit.

       -V, --version
              Display version information.

       0      Successful program execution.

       1      Usage, syntax or configuration file error.

       2      Operational error.

       16     Nothing was found that matched the criteria specified.

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

              If  $MANPATH  is  set,  its value is interpreted as the colon-delimited manual page
              hierarchy search path to use.

              If $MANWIDTH is set, its value is used  as  the  terminal  width  (see  the  --long
              option).   If  it is not set, the terminal width will be calculated using the value
              of $COLUMNS, an ioctl(2) if available, or falling back to 80 characters if all else

              A traditional global index database cache.

              An FHS compliant global index database cache.

              A traditional whatis text database.

       apropos(1), man(1), mandb(8)

       Wilf. (G.Wilford AT ee.uk).
       Fabrizio Polacco (fpolacco AT debian.org).
       Colin Watson (cjwatson AT debian.org).                                     2014-09-28                                  WHATIS(1)

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