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       apropos - search the manual page names and descriptions


       apropos  [-dhV] [-e|-w|-r] [-s section] [-m system[,...]] [-M path] [-C
       file] keyword ...


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

       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.


       -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 boundaries in the description.

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

       -s section, --section section
              Search only the given manual section.  If section  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  section  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

              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 $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

       -C file, --config-file=file
              Use  this  user  configuration  file  rather than the default of

       -h, --help
              Print a help 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 $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 alternate or FHS compliant global index database cache.

              A traditional whatis text database.


       whatis(1), man(1).


       Wilf. (
       Fabrizio Polacco (