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    Command:

    pwck

    
    
    

    SYNOPSIS

           pwck [-q] [-s] [passwd [ shadow ]]
    
           pwck [-q] [-r] [passwd [ shadow ]]
    
    
    

    DESCRIPTION

           The pwck command verifies the integrity of the users and authentication
           information. It checks that all entries in /etc/passwd and /etc/shadow
           have the proper format and contain valid data. The user is prompted to
           delete entries that are improperly formatted or which have other
           uncorrectable errors.
    
           Checks are made to verify that each entry has:
    
           ?   the correct number of fields
    
           ?   a unique and valid user name
    
           ?   a valid user and group identifier
    
           ?   a valid primary group
    
           ?   a valid home directory
    
           ?   a valid login shell
    
           shadow checks are enabled when a second file parameter is specified or
           when /etc/shadow exists on the system.
    
           These checks are the following:
    
           ?   every passwd entry has a matching shadow entry, and every shadow
               entry has a matching passwd entry
    
           ?   passwords are specified in the shadowed file
    
           ?   shadow entries have the correct number of fields
    
           ?   shadow entries are unique in shadow
    
           ?   the last password changes are not in the future
    
           The checks for correct number of fields and unique user name are fatal.
           If the entry has the wrong number of fields, the user will be prompted
           to delete the entire line. If the user does not answer affirmatively,
           all further checks are bypassed. An entry with a duplicated user name
           is prompted for deletion, but the remaining checks will still be made.
           All other errors are warning and the user is encouraged to run the
           usermod command to correct the error.
    
           The commands which operate on the /etc/passwd file are not able to
               Sort entries in /etc/passwd and /etc/shadow by UID.
    
           By default, pwck operates on the files /etc/passwd and /etc/shadow. The
           user may select alternate files with the passwd and shadow parameters.
    
    
    

    CONFIGURATION

           The following configuration variables in /etc/login.defs change the
           behavior of this tool:
    
           PASS_MAX_DAYS (number)
               The maximum number of days a password may be used. If the password
               is older than this, a password change will be forced. If not
               specified, -1 will be assumed (which disables the restriction).
    
           PASS_MIN_DAYS (number)
               The minimum number of days allowed between password changes. Any
               password changes attempted sooner than this will be rejected. If
               not specified, -1 will be assumed (which disables the restriction).
    
           PASS_WARN_AGE (number)
               The number of days warning given before a password expires. A zero
               means warning is given only upon the day of expiration, a negative
               value means no warning is given. If not specified, no warning will
               be provided.
    
    
    

    FILES

           /etc/group
               Group account information.
    
           /etc/passwd
               User account information.
    
           /etc/shadow
               Secure user account information.
    
    
    

    EXIT VALUES

           The pwck command exits with the following values:
    
           0
               success
    
           1
               invalid command syntax
    
           2
               one or more bad password entries
    
           3
               can?t open password files
    
           4
               can?t lock password files
    
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