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           gpasswd [option] group


           The gpasswd command is used to administer /etc/group, and /etc/gshadow.
           Every group can have administrators, members and a password.
           System administrators can use the -A option to define group
           administrator(s) and the -M option to define members. They have all
           rights of group administrators and members.
           gpasswd called by a group administrator with a group name only prompts
           for the new password of the group.
           If a password is set the members can still use newgrp(1) without a
           password, and non-members must supply the password.
       Notes about group passwords
           Group passwords are an inherent security problem since more than one
           person is permitted to know the password. However, groups are a useful
           tool for permitting co-operation between different users.


           Except for the -A and -M options, the options cannot be combined.
           The options which apply to the gpasswd command are:
           -a, --add user
               Add the user to the named group.
           -d, --delete user
               Remove the user from the named group.
           -h, --help
               Display help message and exit.
           -Q, --root CHROOT_DIR
               Apply changes in the CHROOT_DIR directory and use the configuration
               files from the CHROOT_DIR directory.
           -r, --remove-password
               Remove the password from the named group. The group password will
               be empty. Only group members will be allowed to use newgrp to join
               the named group.
           -R, --restrict
               Restrict the access to the named group. The group password is set
               to "!". Only group members with a password will be allowed to use
               newgrp to join the named group.
           -A, --administrators user,...
           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,
               Note: this parameter overrides the MD5_CRYPT_ENAB variable.
           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
               This variable is superseded 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.
           SHA_CRYPT_MIN_ROUNDS (number), SHA_CRYPT_MAX_ROUNDS (number)
               When ENCRYPT_METHOD is set to SHA256 or SHA512, this defines the
               number of SHA rounds used by the encryption algorithm by default
               (when the number of rounds is not specified on the command line).
               With a lot of rounds, it is more difficult to brute forcing the
               password. But note also that more CPU resources will be needed to
               authenticate users.
               If not specified, the libc will choose the default number of rounds
               Secure group account information.


           newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8), group(5),

    shadow-utils 05/10/2016 GPASSWD(1)


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