USERMOD(8) | 系统管理命令 | USERMOD(8) |
名称¶
usermod - 修改一个用户账户
大纲¶
usermod [选项] 登录
描述¶
The usermod command modifies the system account files to reflect the changes that are specified on the command line.
选项¶
The options which apply to the usermod command are:
-a, --append
-c, --comment COMMENT
-d, --home HOME_DIR
If the -m option is given, the contents of the current home directory will be moved to the new home directory, which is created if it does not already exist. If the current home directory does not exist the new home directory will not be created.
-e, --expiredate EXPIRE_DATE
An empty EXPIRE_DATE argument will disable the expiration of the account.
This option requires a /etc/shadow file. A /etc/shadow entry will be created if there were none.
-f, --inactive INACTIVE
0 表示密码过期时,立即禁用账户;-1 表示不使用这个功能。
This option requires a /etc/shadow file. A /etc/shadow entry will be created if there were none.
-g, --gid GROUP
用户主目录中,属于原来的主组的文件将转交新组所有。
主目录之外的文件所属的组必须手动修改。
The change of the group ownership of files inside of the user's home directory is also not done if the home dir owner uid is different from the current or new user id. This is safety measure for special home directories such as /.
-G, --groups GROUP1[,GROUP2,...[,GROUPN]]]
If the user is currently a member of a group which is not listed, the user will be removed from the group. This behaviour can be changed via the -a option, which appends the user to the current supplementary group list.
-l, --login NEW_LOGIN
-L, --lock
Note: if you wish to lock the account (not only access with a password), you should also set the EXPIRE_DATE to 1.
-m, --move-home
This option is only valid in combination with the -d (or --home) option.
usermod will try to adapt the ownership of the files and to copy the modes, ACL and extended attributes, but manual changes might be needed afterwards.
-o, --non-unique
-p, --password PASSWORD
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
-P, --prefix PREFIX_DIR
-s, --shell SHELL
-u, --uid UID
This value must be unique, unless the -o option is used. The value must be non-negative.
用户的邮箱,用户主目录中属于此用户的文件的属主 ID 也将自动更改。
用户主目录之外文件所有权必须手动修复。
The change of the user ownership of files inside of the user's home directory is also not done if the home dir owner uid is different from the current or new user id. This is safety measure for special home directories such as /.
No checks will be performed with regard to the UID_MIN, UID_MAX, SYS_UID_MIN, or SYS_UID_MAX from /etc/login.defs.
-U, --unlock
Note: if you wish to unlock the account (not only access with a password), you should also set the EXPIRE_DATE (for example to 99999, or to the EXPIRE value from /etc/default/useradd).
-v, --add-subuids FIRST-LAST
This option may be specified multiple times to add multiple ranges to a users account.
No checks will be performed with regard to SUB_UID_MIN, SUB_UID_MAX, or SUB_UID_COUNT from /etc/login.defs.
-V, --del-subuids FIRST-LAST
This option may be specified multiple times to remove multiple ranges to a users account. When both --del-subuids and --add-subuids are specified, the removal of all subordinate uid ranges happens before any subordinate uid range is added.
No checks will be performed with regard to SUB_UID_MIN, SUB_UID_MAX, or SUB_UID_COUNT from /etc/login.defs.
-w, --add-subgids FIRST-LAST
This option may be specified multiple times to add multiple ranges to a users account.
No checks will be performed with regard to SUB_GID_MIN, SUB_GID_MAX, or SUB_GID_COUNT from /etc/login.defs.
-W, --del-subgids FIRST-LAST
This option may be specified multiple times to remove multiple ranges to a users account. When both --del-subgids and --add-subgids are specified, the removal of all subordinate gid ranges happens before any subordinate gid range is added.
No checks will be performed with regard to SUB_GID_MIN, SUB_GID_MAX, or SUB_GID_COUNT from /etc/login.defs.
-Z, --selinux-user SEUSER
A blank SEUSER will remove the SELinux user mapping for user LOGIN (if any).
CAVEATS¶
You must make certain that the named user is not executing any processes when this command is being executed if the user's numerical user ID, the user's name, or the user's home directory is being changed. usermod checks this on Linux. On other platforms it only uses utmp to check if the user is logged in.
You must change the owner of any crontab files or at jobs manually.
您必须更改 NIS 服务器上的 NIS 相关内容。
配置文件¶
The following configuration variables in /etc/login.defs change the behavior of this tool:
MAIL_DIR (string)
MAIL_FILE (string)
The MAIL_DIR and MAIL_FILE variables are used by useradd, usermod, and userdel to create, move, or delete the user's mail spool.
If MAIL_CHECK_ENAB is set to yes, they are also used to define the MAIL environment variable.
MAX_MEMBERS_PER_GROUP (number)
默认值是 0,意味着组中的成员数没有限制。
此功能(分割组)允许限制组文件中的行长度。这对于确保 NIS 组的行比长于 1024 字符。
如果要强制这个限制,可以使用 25。
注意:分割组可能不受所有工具的支持(甚至在 Shadow 工具集中)。您不应该使用这个变量,除非真的需要。
SUB_GID_MIN (number), SUB_GID_MAX (number), SUB_GID_COUNT (number)
The default values for SUB_GID_MIN, SUB_GID_MAX, SUB_GID_COUNT are respectively 100000, 600100000 and 65536.
SUB_UID_MIN (number), SUB_UID_MAX (number), SUB_UID_COUNT (number)
The default values for SUB_UID_MIN, SUB_UID_MAX, SUB_UID_COUNT are respectively 100000, 600100000 and 65536.
文件¶
/etc/group
/etc/gshadow
/etc/login.defs
/etc/passwd
/etc/shadow
/etc/subgid
/etc/subuid
参见¶
chfn(1), chsh(1), passwd(1), crypt(3), gpasswd(8), groupadd(8), groupdel(8), groupmod(8), login.defs(5), subgid(5), subuid(5),useradd(8), userdel(8).
2019-08-07 | shadow-utils 4.6 |