mandb(8)

NAME
mandb - create or update the manual page index caches

SYNOPSIS
mandb [-dqsuc|-h|-V ] [manpath]

DESCRIPTION
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.

DATABASE CACHES
mandb can be compiled with support for any one of the following database types.
Name | Type | Async | Filename
Berkeley db | Binary tree | Yes | index.bt
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 occured, it may be necessary to rerun mandb with the -c option to re-create the databases from scratch.

OPTIONS

-d, --debug
    Produce 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 databases.

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

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

DIAGNOSTICS
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 ignored.

FILES

/etc/manpath.config
    man_db configuration file.

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

/var/catman/index.(bt|db|dir|pag)
    An alternate or FSSTND compliant global index database cache.

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

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

The WHATIS PARSING section formerly in this manual page is now part of lexgrog(1).

AUTHOR
Wilf. (G.Wilford@ee.surrey.ac.uk).
Fabrizio Polacco (fpolacco@debian.org).
Colin Watson (cjwatson@debian.org).