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    Command:

    chgpasswd

    
    
    

    SYNOPSIS

           chgpasswd [options]
    
    
    

    DESCRIPTION

           The chgpasswd command reads a list of group name and password pairs
           from standard input and uses this information to update a set of
           existing groups. Each line is of the format:
    
           group_name:password
    
           By default the supplied password must be in clear-text, and is
           encrypted by chgpasswd.
    
           The default encryption algorithm can be defined for the system with the
           ENCRYPT_METHOD variable of /etc/login.defs, and can be overwiten with
           the -e, -m, or -c options.
    
           This command is intended to be used in a large system environment where
           many accounts are created at a single time.
    
    
    

    OPTIONS

           The options which apply to the chgpasswd command are:
    
           -c, --crypt-method
               Use the specified method to encrypt the passwords.
    
               The available methods are DES, MD5, NONE, and SHA256 or SHA512 if
               your libc support these methods.
    
           -e, --encrypted
               Supplied passwords are in encrypted form.
    
           -h, --help
               Display help message and exit.
    
           -m, --md5
               Use MD5 encryption instead of DES when the supplied passwords are
               not encrypted.
    
           -s, --sha-rounds
               Use the specified number of rounds to encrypt the passwords.
    
               The value 0 means that the system will choose the default number of
               rounds for the crypt method (5000).
    
               A minimal value of 1000 and a maximal value of 999,999,999 will be
               enforced.
    
               You can only use this option with the SHA256 or SHA512 crypt
               method.
    
    
           ENCRYPT_METHOD (string)
               This defines the system default encryption algorithm for encrypting
               passwords (if no algorithm are specified on the command line).
    
               It can take one of these values: DES (default), MD5, SHA256,
               SHA512.
    
               Note: this parameter overrides the MD5_CRYPT_ENAB variable.
    
               Note: This only affect the generation of group passwords. The
               generation of user passwords is done by PAM and subject to the PAM
               configuration. It is recommended to set this variable consistently
               with the PAM configuration.
    
           MAX_MEMBERS_PER_GROUP (number)
               Maximum members per group entry. When the maximum is reached, a new
               group entry (line) is started in /etc/group (with the same name,
               same password, and same GID).
    
               The default value is 0, meaning that there are no limits in the
               number of members in a group.
    
               This feature (split group) permits to limit the length of lines in
               the group file. This is useful to make sure that lines for NIS
               groups are not larger than 1024 characters.
    
               If you need to enforce such limit, you can use 25.
    
               Note: split groups may not be supported by all tools (even in the
               Shadow toolsuite). You should not use this variable unless you
               really need it.
    
           MD5_CRYPT_ENAB (boolean)
               Indicate if passwords must be encrypted using the MD5-based
               algorithm. If set to yes, new passwords will be encrypted using the
               MD5-based algorithm compatible with the one used by recent releases
               of FreeBSD. It supports passwords of unlimited length and longer
               salt strings. Set to no if you need to copy encrypted passwords to
               other systems which don't understand the new algorithm. Default is
               no.
    
               This variable is superceded by the ENCRYPT_METHOD variable or by
               any command line option used to configure the encryption algorithm.
    
               This variable is deprecated. You should use ENCRYPT_METHOD.
    
               Note: This only affect the generation of group passwords. The
               generation of user passwords is done by PAM and subject to the PAM
               configuration. It is recommended to set this variable consistently
               with the PAM configuration.
    
               If only one of the SHA_CRYPT_MIN_ROUNDS or SHA_CRYPT_MAX_ROUNDS
               values is set, then this value will be used.
    
               If SHA_CRYPT_MIN_ROUNDS > SHA_CRYPT_MAX_ROUNDS, the highest value
               will be used.
    
               Note: This only affect the generation of group passwords. The
               generation of user passwords is done by PAM and subject to the PAM
               configuration. It is recommended to set this variable consistently
               with the PAM configuration.
    
    
    

    FILES

           /etc/group
               Group account information.
    
           /etc/gshadow
               Secure group account information.
    
           /etc/login.defs
               Shadow password suite configuration.
    
    
    

    SEE ALSO

           gpasswd(1), groupadd(8), login.defs(5).
    
    
    

    System Management Commands 04/09/2012 CHGPASSWD(8)

    
    
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