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Diffstat (limited to 'man/man8/groupadd.8')
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diff --git a/man/man8/groupadd.8 b/man/man8/groupadd.8 new file mode 100644 index 0000000..af8afcf --- /dev/null +++ b/man/man8/groupadd.8 @@ -0,0 +1,277 @@ +'\" t +.\" Title: groupadd +.\" Author: Julianne Frances Haugh +.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> +.\" Date: 11/08/2022 +.\" Manual: System Management Commands +.\" Source: shadow-utils 4.13 +.\" Language: English +.\" +.TH "GROUPADD" "8" "11/08/2022" "shadow\-utils 4\&.13" "System Management Commands" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +groupadd \- create a new group +.SH "SYNOPSIS" +.HP \w'\fBgroupadd\fR\ 'u +\fBgroupadd\fR [\fIOPTIONS\fR] \fINEWGROUP\fR +.SH "DESCRIPTION" +.PP +The +\fBgroupadd\fR +command creates a new group account using the values specified on the command line plus the default values from the system\&. The new group will be entered into the system files as needed\&. +.PP +Groupnames may contain only lower and upper case letters, digits, underscores, or dashes\&. They can end with a dollar sign\&. Dashes are not allowed at the beginning of the groupname\&. Fully numeric groupnames and groupnames \&. or \&.\&. are also disallowed\&. +.PP +Groupnames may only be up to 32 characters long\&. +.SH "OPTIONS" +.PP +The options which apply to the +\fBgroupadd\fR +command are: +.PP +\fB\-f\fR, \fB\-\-force\fR +.RS 4 +This option causes the command to simply exit with success status if the specified group already exists\&. When used with +\fB\-g\fR, and the specified GID already exists, another (unique) GID is chosen (i\&.e\&. +\fB\-g\fR +is turned off)\&. +.RE +.PP +\fB\-g\fR, \fB\-\-gid\fR\ \&\fIGID\fR +.RS 4 +The numerical value of the group\*(Aqs ID\&. +\fIGID\fR +must be unique, unless the +\fB\-o\fR +option is used\&. The value must be non\-negative\&. The default is to use the smallest ID value greater than or equal to +\fBGID_MIN\fR +and greater than every other group\&. +.sp +See also the +\fB\-r\fR +option and the +\fBGID_MAX\fR +description\&. +.RE +.PP +\fB\-h\fR, \fB\-\-help\fR +.RS 4 +Display help message and exit\&. +.RE +.PP +\fB\-K\fR, \fB\-\-key\fR\ \&\fIKEY\fR=\fIVALUE\fR +.RS 4 +Overrides +/etc/login\&.defs +defaults (GID_MIN, GID_MAX and others)\&. Multiple +\fB\-K\fR +options can be specified\&. +.sp +Example: +\fB\-K\fR\ \&\fIGID_MIN\fR=\fI100\fR\ \& +\fB\-K\fR\ \&\fIGID_MAX\fR=\fI499\fR +.sp +Note: +\fB\-K\fR\ \&\fIGID_MIN\fR=\fI10\fR,\fIGID_MAX\fR=\fI499\fR +doesn\*(Aqt work yet\&. +.RE +.PP +\fB\-o\fR, \fB\-\-non\-unique\fR +.RS 4 +permits the creation of a group with an already used numerical ID\&. As a result, for this +\fIGID\fR, the mapping towards group +\fINEWGROUP\fR +may not be unique\&. +.RE +.PP +\fB\-p\fR, \fB\-\-password\fR\ \&\fIPASSWORD\fR +.RS 4 +defines an initial password for the group account\&. PASSWORD is expected to be encrypted, as returned by +\fBcrypt \fR(3)\&. +.sp +Without this option, the group account will be locked and with no password defined, i\&.e\&. a single exclamation mark in the respective field of ths system account file +/etc/group +or +/etc/gshadow\&. +.sp +\fBNote:\fR +This option is not recommended because the password (or encrypted password) will be visible by users listing the processes\&. +.sp +You should make sure the password respects the system\*(Aqs password policy\&. +.RE +.PP +\fB\-r\fR, \fB\-\-system\fR +.RS 4 +Create a system group\&. +.sp +The numeric identifiers of new system groups are chosen in the +\fBSYS_GID_MIN\fR\-\fBSYS_GID_MAX\fR +range, defined in +login\&.defs, instead of +\fBGID_MIN\fR\-\fBGID_MAX\fR\&. +.RE +.PP +\fB\-R\fR, \fB\-\-root\fR\ \&\fICHROOT_DIR\fR +.RS 4 +Apply changes in the +\fICHROOT_DIR\fR +directory and use the configuration files from the +\fICHROOT_DIR\fR +directory\&. Only absolute paths are supported\&. +.RE +.PP +\fB\-P\fR, \fB\-\-prefix\fR\ \&\fIPREFIX_DIR\fR +.RS 4 +Apply changes to configuration files under the root filesystem found under the directory +\fIPREFIX_DIR\fR\&. This option does not chroot and is intended for preparing a cross\-compilation target\&. Some limitations: NIS and LDAP users/groups are not verified\&. PAM authentication is using the host files\&. No SELINUX support\&. +.RE +.PP +\fB\-U\fR, \fB\-\-users\fR +.RS 4 +A list of usernames to add as members of the group\&. +.sp +The default behavior (if the +\fB\-g\fR, +\fB\-N\fR, and +\fB\-U\fR +options are not specified) is defined by the +\fBUSERGROUPS_ENAB\fR +variable in +/etc/login\&.defs\&. +.RE +.SH "CONFIGURATION" +.PP +The following configuration variables in +/etc/login\&.defs +change the behavior of this tool: +.PP +\fBGID_MAX\fR (number), \fBGID_MIN\fR (number) +.RS 4 +Range of group IDs used for the creation of regular groups by +\fBuseradd\fR, +\fBgroupadd\fR, or +\fBnewusers\fR\&. +.sp +The default value for +\fBGID_MIN\fR +(resp\&. +\fBGID_MAX\fR) is 1000 (resp\&. 60000)\&. +.RE +.PP +\fBMAX_MEMBERS_PER_GROUP\fR (number) +.RS 4 +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)\&. +.sp +The default value is 0, meaning that there are no limits in the number of members in a group\&. +.sp +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\&. +.sp +If you need to enforce such limit, you can use 25\&. +.sp +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\&. +.RE +.PP +\fBSYS_GID_MAX\fR (number), \fBSYS_GID_MIN\fR (number) +.RS 4 +Range of group IDs used for the creation of system groups by +\fBuseradd\fR, +\fBgroupadd\fR, or +\fBnewusers\fR\&. +.sp +The default value for +\fBSYS_GID_MIN\fR +(resp\&. +\fBSYS_GID_MAX\fR) is 101 (resp\&. +\fBGID_MIN\fR\-1)\&. +.RE +.SH "FILES" +.PP +/etc/group +.RS 4 +Group account information\&. +.RE +.PP +/etc/gshadow +.RS 4 +Secure group account information\&. +.RE +.PP +/etc/login\&.defs +.RS 4 +Shadow password suite configuration\&. +.RE +.SH "CAVEATS" +.PP +You may not add a NIS or LDAP group\&. This must be performed on the corresponding server\&. +.PP +If the groupname already exists in an external group database such as NIS or LDAP, +\fBgroupadd\fR +will deny the group creation request\&. +.SH "EXIT VALUES" +.PP +The +\fBgroupadd\fR +command exits with the following values: +.PP +\fI0\fR +.RS 4 +success +.RE +.PP +\fI2\fR +.RS 4 +invalid command syntax +.RE +.PP +\fI3\fR +.RS 4 +invalid argument to option +.RE +.PP +\fI4\fR +.RS 4 +GID is already used (when called without +\fB\-o\fR) +.RE +.PP +\fI9\fR +.RS 4 +group name is already used +.RE +.PP +\fI10\fR +.RS 4 +can\*(Aqt update group file +.RE +.SH "SEE ALSO" +.PP +\fBchfn\fR(1), +\fBchsh\fR(1), +\fBpasswd\fR(1), +\fBgpasswd\fR(8), +\fBgroupdel\fR(8), +\fBgroupmod\fR(8), +\fBlogin.defs\fR(5), +\fBuseradd\fR(8), +\fBuserdel\fR(8), +\fBusermod\fR(8)\&. |