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Command: man perldoc info search(apropos)  

APROPOS(1)                                             Manual pager utils                                             APROPOS(1)

       apropos - search the manual page names and descriptions

       apropos [-dalv?V] [-e|-w|-r] [-s list] [-m system[,...]] [-M path] [-L locale] [-C file] keyword ...

       Each  manual  page  has a short description available within it.  apropos searches the descriptions for instances of key-

       keyword is usually a regular expression, as if (-r) was used, or may contain wildcards (-w), or match the  exact  keyword
       (-e).   Using  these  options,  it may be necessary to quote the keyword or escape (\) the special characters to stop the
       shell from interpreting them.

       The standard matching rules allow matches to be made against the page name and word boundaries in the description.

       The database searched by apropos is updated by the mandb program.  Depending 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.

       -d, --debug
              Print debugging information.

       -v, --verbose
              Print verbose warning messages.

       -r, --regex
              Interpret  each  keyword  as  a  regular expression.  This is the default behaviour.  Each keyword will be matched
              against the page names and the descriptions independently.  It can match any part of either.   The  match  is  not
              limited to word boundaries.

       -w, --wildcard
              Interpret  each  keyword  as a pattern containing shell style wildcards.  Each keyword will be matched against the
              page names and the descriptions independently.  If --exact is also used, a match will only be found if an expanded
              keyword matches an entire description or page name.  Otherwise the keyword is also allowed to match on word bound-
              aries in the description.

       -e, --exact
              Each keyword will be exactly matched against the page names and the descriptions.

       -a, --and
              Only display items that match all the supplied keywords.  The default is to display items that match any keyword.

       -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 displayed 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 descriptions, they can be  searched  using  this
              option.  To search NewOS's manual page descriptions, 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 whatis descriptions, 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, apropos uses the $MAN-
              PATH 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
              apropos  will  normally  determine your current locale by a call to the C function setlocale(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 apropos.  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 ter-
              minal width will be calculated using the value of $COLUMNS, an ioctl(2) if available, or falling back to 80  char-
              acters if all else fails.

              If  $POSIXLY_CORRECT  is  set, even to a null value, the default apropos search will be as an extended regex (-r).
              Nowadays, this is the default behaviour anyway.

              A traditional global index database cache.

              An FHS compliant global index database cache.

              A traditional whatis text database.

       man(1), whatis(1), mandb(8)

       Wilf. (G.WilfordATee.uk).
       Fabrizio Polacco (fpolaccoATdebian.org).
       Colin Watson (cjwatsonATdebian.org).

2.8.4                                                      2018-07-27                                                 APROPOS(1)

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