180 lines
4.7 KiB
Groff
180 lines
4.7 KiB
Groff
'\" t
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.\" Title: groupmems
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.\" Author: George Kraft, IV
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.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
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.\" Date: 03/19/2025
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.\" Manual: System Management Commands
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.\" Source: shadow-utils 4.17.4
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.\" Language: English
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.\"
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.TH "GROUPMEMS" "8" "03/19/2025" "shadow\-utils 4\&.17\&.4" "System Management Commands"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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groupmems \- administer members of a user\*(Aqs primary group
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.SH "SYNOPSIS"
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.HP \w'\fBgroupmems\fR\ 'u
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\fBgroupmems\fR \-a\ \fIuser_name\fR | \-d\ \fIuser_name\fR | [\-g\ \fIgroup_name\fR] | \-l | \-p
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.SH "DESCRIPTION"
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.PP
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The
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\fBgroupmems\fR
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command allows a user to administer their own group membership list without the requirement of superuser privileges\&. The
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\fBgroupmems\fR
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utility is for systems that configure its users to be in their own name sake primary group (i\&.e\&., guest / guest)\&.
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.PP
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Only the superuser, as administrator, can use
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\fBgroupmems\fR
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to alter the memberships of other groups\&.
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.SH "OPTIONS"
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.PP
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The options which apply to the
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\fBgroupmems\fR
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command are:
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.PP
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\fB\-a\fR, \fB\-\-add\fR\ \&\fIuser_name\fR
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.RS 4
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Add a user to the group membership list\&.
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.sp
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If the
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/etc/gshadow
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file exist, and the group has no entry in the
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/etc/gshadow
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file, a new entry will be created\&.
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.RE
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.PP
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\fB\-d\fR, \fB\-\-delete\fR\ \&\fIuser_name\fR
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.RS 4
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Delete a user from the group membership list\&.
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.sp
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If the
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/etc/gshadow
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file exist, the user will be removed from the list of members and administrators of the group\&.
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.sp
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If the
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/etc/gshadow
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file exist, and the group has no entry in the
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/etc/gshadow
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file, a new entry will be created\&.
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.RE
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.PP
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\fB\-g\fR, \fB\-\-group\fR\ \&\fIgroup_name\fR
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.RS 4
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The superuser can specify which group membership list to modify\&.
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.RE
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.PP
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\fB\-h\fR, \fB\-\-help\fR
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.RS 4
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Display help message and exit\&.
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.RE
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.PP
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\fB\-l\fR, \fB\-\-list\fR
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.RS 4
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List the group membership list\&.
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.RE
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.PP
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\fB\-p\fR, \fB\-\-purge\fR
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.RS 4
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Purge all users from the group membership list\&.
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.sp
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If the
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/etc/gshadow
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file exist, and the group has no entry in the
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/etc/gshadow
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file, a new entry will be created\&.
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.RE
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.PP
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\fB\-R\fR, \fB\-\-root\fR\ \&\fICHROOT_DIR\fR
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.RS 4
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Apply changes in the
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\fICHROOT_DIR\fR
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directory and use the configuration files from the
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\fICHROOT_DIR\fR
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directory\&. Only absolute paths are supported\&.
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.RE
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.SH "SETUP"
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.PP
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The
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\fBgroupmems\fR
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executable should be in mode
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2710
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as user
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\fIroot\fR
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and in group
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\fIgroups\fR\&. The system administrator can add users to group
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\fIgroups\fR
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to allow or disallow them using the
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\fBgroupmems\fR
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utility to manage their own group membership list\&.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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$ groupadd \-r groups
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$ chmod 2710 groupmems
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$ chown root:groups groupmems
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$ groupmems \-g groups \-a gk4
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.fi
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.if n \{\
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.RE
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.\}
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.SH "CONFIGURATION"
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.PP
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The following configuration variables in
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/etc/login\&.defs
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change the behavior of this tool:
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.PP
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\fBMAX_MEMBERS_PER_GROUP\fR (number)
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.RS 4
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Maximum members per group entry\&. When the maximum is reached, a new group entry (line) is started in
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/etc/group
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(with the same name, same password, and same GID)\&.
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.sp
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The default value is 0, meaning that there are no limits in the number of members in a group\&.
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.sp
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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\&.
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.sp
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If you need to enforce such limit, you can use 25\&.
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.sp
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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\&.
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.RE
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.SH "FILES"
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.PP
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/etc/group
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.RS 4
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Group account information\&.
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.RE
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.PP
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/etc/gshadow
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.RS 4
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secure group account information
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.RE
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.SH "SEE ALSO"
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.PP
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\fBchfn\fR(1),
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\fBchsh\fR(1),
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\fBpasswd\fR(1),
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\fBgroupadd\fR(8),
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\fBgroupdel\fR(8),
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\fBuseradd\fR(8),
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\fBuserdel\fR(8),
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\fBusermod\fR(8)\&.
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