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update-cracklib(8) [centos man page]

update-cracklib(8)					      System Manager's Manual						update-cracklib(8)

update-cracklib - Regenerate cracklib dictionary SYNOPSIS
update-cracklib DESCRIPTION
update-cracklib builds a compressed and accumulated version of wordlists stored in the directories given in cracklib's configuration file /etc/cracklib/cracklib.conf. Programs using cracklib2 need this database to be of any use. By default this script is called by cron every day. RESULT
update-cracklib prints out two numbers: the number of words read from the ASCII dictionaries and the number of words eventually written into the cracklib database; if no error occurred, these should be equal. 0 is returned on success, otherwise an error message is printed to standard error and -1 is returned. FILES
/etc/cracklib/cracklib.conf shell script that sets cracklib_dictpath_src which must be a space separated list of source dictionary files. SEE ALSO
cracklib(3), crack_mkdict(8) AUTHOR
This program and manual page was written by Martin Pitt <> for the Debian GNU/Linux System (but may be used by others). Martin Pitt June 09, 2003 update-cracklib(8)

Check Out this Related Man Page

cracklib-format(8)					      Debian GNU/Linux manual						cracklib-format(8)

cracklib-format, cracklib-packer, cracklib-unpacker - cracklib dictionary utilities SYNOPSIS
cracklib-format file ... cracklib-packer cracklib_dictpath cracklib-unpacker cracklib_dictpath DESCRIPTION
cracklib-format takes a list of text files each containing a list of words, one per line, It lowercases all words, removes control charac- ters, and sorts the lists. It outputs the cleaned up list to standard output. The text files may be optionally compressed with gzip(1). If you supply massive amounts of text to cracklib-format you must have enough free space available for use by the sort(1) command. If you do not have 20Mb free in /var/tmp (or whatever temporary area your sort(1) command uses), have a look at the /usr/sbin/cracklib-format pro- gram which is a sh(1) program. You can usually tweak the sort(1) command to use any large area of disk you desire, by use of the -T option. cracklib-format has a hook for this. cracklib-packer reads from standard input a list of sorted and cleaned words and creates a database in the directory and prefix given by the command line argument cracklib_dictpath. Three files are created with the suffixes of .hwm, .pwd, and .pwi. These three files are in the format that the FascistCheck(3) subroutine, cracklib-unpacker(8), and cracklib-check(8), utilities understand. The number of words read and written are printed on stdout(3). cracklib-unpacker reads from the database in the directory and prefix given by the command line argument cracklib_dictpath and outputs on standard output the list of words that make up the database. The database is in a binary format generated by the utilities cracklib-format(8) and cracklib-packer(8). On a Debian system the database is located in the directory /var/cache/cracklib/cracklib_dict and is generated daily with the program /etc/cron.daily/cracklib. The loca- tion is also defined in the header file crack.h using the constant CRACKLIB_DICTPATH though none of the subroutines in the cracklib libraries have this location hardcoded into their implementations. FILES
/var/cache/cracklib/cracklib_dict.[hwm|pwd|pwi] cracklib dictionary database files used by utilities. /etc/cron.daily/cracklib cracklib daily cron program to rebuild the cracklib dictionary database. /etc/cracklib/cracklib.conf cracklib configuration file used by the cracklib daily cron program to rebuild the cracklib dictionary database. /usr/include/crack.h cracklib header file defining the subroutine FascistCheck(3) and the constant CRACKLIB_DICTPATH used to compile in the location of the cracklib dictionary database for these utilities. /usr/sbin/cracklib-format cracklib shell script to create initial list of words for dictionary database. SEE ALSO
FascistCheck(3), cracklib-check(8), update-cracklib(8), create-cracklib-dict(8) /usr/share/doc/libcrack2/libcrack2.html /usr/share/doc/cracklib-runtime/cracklib-runtime.html AUTHOR
cracklib2 is written by Alec Muffett <>. Manual added by Jean Pierre LeJacq <>. 2.7-8.5 Sat Jun 21 22:43:12 CEST 2008 cracklib-format(8)
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