Provided by: passwd_4.13+dfsg1-4ubuntu3.2_amd64 
名称
groupmod - modify a group definition on the system
大纲
groupmod [选项] GROUP
描述
The groupmod command modifies the definition of the specified GROUP by modifying the appropriate entry in
the group database.
选项
The options which apply to the groupmod command are:
-a, --append GID
If group members are specified with -U, append them to the existing member list, rather than
replacing it.
-g, --gid GID
The group ID of the given GROUP will be changed to GID.
The value of GID must be a non-negative decimal integer. This value must be unique, unless the -o
option is used.
Users who use the group as primary group will be updated to keep the group as their primary group.
Any files that have the old group ID and must continue to belong to GROUP, must have their group ID
changed manually.
No checks will be performed with regard to the GID_MIN, GID_MAX, SYS_GID_MIN, or SYS_GID_MAX from
/etc/login.defs.
-h, --help
显示帮助信息并退出。
-n, --new-name NEW_GROUP
The name of the group will be changed from GROUP to NEW_GROUP name.
-o, --non-unique
When used with the -g option, allow to change the group GID to a non-unique value.
-p, --password PASSWORD
The encrypted password, as returned by crypt(3).
Note: This option is not recommended because the password (or encrypted password) will be visible by
users listing the processes.
您应该确保密码符合系统的密码政策。
-R, --root CHROOT_DIR
Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR
directory. Only absolute paths are supported.
-P, --prefix PREFIX_DIR
Apply changes in the PREFIX_DIR directory and use the configuration files from the PREFIX_DIR
directory. 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.
-U, --users
A list of usernames to add as members of the group.
The default behavior (if the -g, -N, and -U options are not specified) is defined by the
USERGROUPS_ENAB variable in /etc/login.defs.
配置文件
The following configuration variables in /etc/login.defs change the behavior of this tool:
文件
/etc/group 组账户信息。 /etc/gshadow 安全组账户信息。 /etc/login.defs Shadow 密码套件配置。 /etc/passwd 用户账户信息。
退出值
The groupmod command exits with the following values:
0
E_SUCCESS: success
2
E_USAGE: invalid command syntax
3
E_BAD_ARG: invalid argument to option
4
E_GID_IN_USE: group id already in use
6
E_NOTFOUND: specified group doesn't exist
9
E_NAME_IN_USE: group name already in use
10
E_GRP_UPDATE: can't update group file
11
E_CLEANUP_SERVICE: can't setup cleanup service
12
E_PAM_USERNAME: can't determine your username for use with pam
13
E_PAM_ERROR: pam returned an error, see syslog facility id groupmod for the PAM error message
参见
chfn(1), chsh(1), passwd(1), gpasswd(8), groupadd(8), groupdel(8), login.defs(5), useradd(8), userdel(8), usermod(8).