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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.
           -r, --remove-password
               Remove the password from the named group. Only group members will
               be allowed to use newgrp to join the named group.
           -R, --restrict
               Restrict the access to the named group. Only group members will be
               allowed to use newgrp to join the named group.
           -A, --administrators user,...
               Set the list of administrative users.
           -M, --members user,...
               Set the list of group members.


           This tool only operates on the /etc/group and /etc/gshadow files.  Thus
           you cannot change any NIS or LDAP group. This must be performed on the
           corresponding server.
               ?   SHA256
               ?   SHA512
                   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 no.
                   This variable is superceded by the ENCRYPT_METHOD variable or
                   by any command line option used to configure the encryption
                   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 (5000).
               Secure group account information.


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

    User Commands 07/24/2009 GPASSWD(1)


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