groupmems(8)

1GROUPMEMS(8)              System Management Commands              GROUPMEMS(8)
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NAME

6       groupmems - administer members of a user´s primary group
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SYNOPSIS

9       groupmems -a user_name | -d user_name | [-g group_name] | -l | -p
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DESCRIPTION

12       The groupmems command allows a user to administer his/her own group
13       membership list without the requirement of superuser privileges. The
14       groupmems utility is for systems that configure its users to be in
15       their own name sake primary group (i.e., guest / guest).
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17       Only the superuser, as administrator, can use groupmems to alter the
18       memberships of other groups.
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OPTIONS

21       The options which apply to the groupmems command are:
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23       -a, --add user_name
24           Add an user to the group membership list.
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26           If the /etc/gshadow file exist, and the group has no entry in the
27           /etc/gshadow file, a new entry will be created.
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29       -d, --delete user_name
30           Delete a user from the group membership list.
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32           If the /etc/gshadow file exist, the user will be removed from the
33           list of members and administrators of the group.
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35           If the /etc/gshadow file exist, and the group has no entry in the
36           /etc/gshadow file, a new entry will be created.
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38       -g, --group group_name
39           The superuser can specify which group membership list to modify.
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41       -l, --list
42           List the group membership list.
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44       -p, --purge
45           Purge all users from the group membership list.
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47           If the /etc/gshadow file exist, and the group has no entry in the
48           /etc/gshadow file, a new entry will be created.
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SETUP

51       The groupmems executable should be in mode 2770 as user root and in
52       group groups. The system administrator can add users to group groups to
53       allow or disallow them using the groupmems utility to manage their own
54       group membership list.
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56                $ groupadd -r groups
57                $ chmod 2770 groupmems
58                $ chown root.groups groupmems
59                $ groupmems -g groups -a gk4
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CONFIGURATION

63       The following configuration variables in /etc/login.defs change the
64       behavior of this tool:
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66       MAX_MEMBERS_PER_GROUP (number)
67           Maximum members per group entry. When the maximum is reached, a new
68           group entry (line) is started in /etc/group (with the same name,
69           same password, and same GID).
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71           The default value is 0, meaning that there are no limits in the
72           number of members in a group.
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74           This feature (split group) permits to limit the length of lines in
75           the group file. This is useful to make sure that lines for NIS
76           groups are not larger than 1024 characters.
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78           If you need to enforce such limit, you can use 25.
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80           Note: split groups may not be supported by all tools (even in the
81           Shadow toolsuite). You should not use this variable unless you
82           really need it.
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FILES

85       /etc/group
86           Group account information.
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88       /etc/gshadow
89           secure group account information
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