This utility should be run as root, or by the user who owns the history database. Creation of a new database may require root privileges. A set- ting of 0 disables the age limit. Set the old password retention limit to depth . A set- ting of 0 disables the depth limit.
Standard input is read if no input file is given.
This is the default if the NDBM library is available. D n Set internal debug level to n . V Print version information. This limit is set in the npasswd configuration file, but can be overridden by the - a option. There is a limit to how many passwords are kept for each user.