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       mandb - create or update the manual page index caches


       mandb [-dqsucpt|-h|-V] [-C file] [manpath]
       mandb [-dqsut] [-C file] -f filename ...


       mandb  is  used  to initialise or manually update index database caches
       that are usually maintained by man.   The  caches  contain  information
       relevant  to  the  current  state  of  the  manual  page system and the
       information stored within them is  used  by  the  man-db  utilities  to
       enhance their speed and functionality.

       When  creating  or  updating  an index, mandb will warn of bad ROFF .so
       requests, bogus manual page filenames and manual pages from  which  the
       whatis cannot be parsed.

       Supplying mandb with an optional colon-delimited path will override the
       internal system manual page  hierarchy  search  path,  determined  from
       information found within the man-db configuration file.


       mandb  can  be  compiled  with  support  for  any  one of the following
       database types.

       Name                Type          Async   Filename
       Berkeley db         Binary tree   Yes
       GNU gdbm v >= 1.6   Hashed        Yes     index.db
       GNU gdbm v <  1.6   Hashed        No      index.db
       UNIX ndbm           Hashed        No      index.(dir|pag)

       Those database types that support asynchronous updates provide enhanced
       speed  at  the  cost  of  possible  corruption  in the event of unusual
       termination.  In an unusual case where this has  occurred,  it  may  be
       necessary  to rerun mandb with the -c option to re-create the databases
       from scratch.


       -d, --debug
              Print debugging information.

       -q, --quiet
              Produce no warnings.

       -s, --no-straycats
              Do not spend time looking  for  or  adding  information  to  the
              databases regarding stray cats.

       -p, --no-purge
              Do  not spend time checking for deleted manual pages and purging
              them from the databases.

       -c, --create
              By default, mandb will try  to  update  any  previously  created
              databases.   If  a  database  does not exist, it will create it.
              This option forces mandb to delete previous  databases  and  re-
              create  them  from scratch, and implies --no-purge.  This may be
              necessary if a database becomes corrupt or  if  a  new  database
              storage scheme is introduced in the future.

       -u, --user-db
              Create   user   databases  only,  even  with  write  permissions
              necessary to create system databases.

       -t, --test
              Perform correctness checks on  manual  pages  in  the  hierarchy
              search  path.   With  this option, mandb will not alter existing

       -f, --filename
              Update only the entries for the given filename.  This option  is
              not  for  general  use; it is used internally by man when it has
              been compiled with the MAN_DB_UPDATES option and  finds  that  a
              page is out of date.  It implies -p and disables -c and -s.

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

       -h, --help
              Show the usage message, then exit.

       -V, --version
              Show the version, then exit.


       0      Successful program execution.

       1      Usage, syntax, or configuration file error.

       2      Operational error.

       3      A child process failed.


       The following warning messages can be emitted during database building.

       <filename>: whatis parse for page(sec) failed
              An  attempt  to extract whatis line(s) from the given <filename>
              failed.  This is usually due to a poorly  written  manual  page,
              but  if  many  such  messages  are emitted it is likely that the
              system contains non-standard manual pages which are incompatible
              with  the  man-db whatis parser.  See the WHATIS PARSING section
              in lexgrog(1) for more information.

       <filename>: is a dangling symlink
              <filename> does not exist but is referenced by a symbolic  link.
              Further   diagnostics   are  usually  emitted  to  identify  the
              <filename> of the offending link.

       <filename>: bad symlink or ROFF `.so' request
              <filename> is either a symbolic link  to,  or  contains  a  ROFF
              include request to, a non existent file.

       <filename>: ignoring bogus filename
              The  <filename>  may  or  may not be a valid manual page but its
              name is invalid.  This is usually due  to  a  manual  page  with
              sectional extension <x> being put in manual page section <y>.

       <filename_mask>: competing extensions
              The  wildcard  <filename_mask>  is  not unique.  This is usually
              caused by the existence of both a  compressed  and  uncompressed
              version  of  the  same manual page.  All but the most recent are


              man-db configuration file.

              An FHS compliant global index database cache.

       Older locations for the database cache included:

              A traditional global index database cache.

              An alternate or FSSTND compliant global index database cache.


       man(1), lexgrog(1), manpath(5), catman(8).

       The WHATIS PARSING section formerly in this manual page is now part  of


       Wilf. (
       Fabrizio Polacco (
       Colin Watson (