Provided by: passwd_4.1.4.1-1ubuntu2_i386 bug

НАЗВАНИЕ
       usermod - изменяет учётную запись пользователя


СИНТАКСИС
       usermod [] LOGIN


ОПИСАНИЕ
       Команда usermod изменяет системные файлы учётных записей согласно
       переданным в командной строке параметрам.


ПАРАМЕТРЫ
       Параметры команды usermod:

       -a, --append
           Add the user to the supplementary group(s). Use only with the -G
           option.

       -c, --comment
           Новое значение поля комментария в файле пользовательских паролей.
           Обычно его изменяют с помощью программы chfn(1).

       -d, --home_
           The user's new login directory.

           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.

       -e, --expiredate_
           Дата, когда учётная запись пользователя будет заблокирована. Дата
           задаётся в формате --.

       -f, --inactive
           The number of days after a password expires until the account is
           permanently disabled.

           A value of 0 disables the account as soon as the password has
           expired, and a value of -1 disables the feature.

       -g, --gid
           The group name or number of the user's new initial login group. The
           group must exist.

       -G, --groups1[,2,...[,N]]]
           A list of supplementary groups which the user is also a member of.
           Each group is separated from the next by a comma, with no
           intervening whitespace. The groups are subject to the same
           restrictions as the group given with the -g option.

           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_
           The name of the user will be changed from LOGIN to NEW_LOGIN.
           Nothing else is changed. In particular, the user's home directory
           name should probably be changed manually to reflect the new login
           name.

       -L, --lock
           Заблокировать пароль пользователя. Это делается помещением символа
           '!' в начало шифрованного пароля, чтобы приводит к блокировке
           пароля. Не используйте этот параметр вместе с -p или -U.

           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
           Move the content of the user's home directory to the new location.

           This option is only valid in combination with the -d (or --home)
           option.

       -o, --non-unique
           При использовании с параметром -u, этот параметр позволяет
           указывать не уникальный числовой идентификатор пользователя.

       -p, --password
           Шифрованное значение пароля, которое возвращает функция crypt(3).

           Note: This option is not recommended because the password (or
           encrypted password) will be visible by users listing the processes.

           The password will be written in the local /etc/passwd or
           /etc/shadow file. This might differ from the password database
           configured in your PAM configuration.

           You should make sure the password respects the system's password
           policy.

       -s, --shell
           Имя новой регистрационной оболочки пользователя. Если задать пустое
           значение, то будет использована регистрационная оболочка по
           умолчанию.

       -u, --uidUID
           The new numerical value of the user's ID.

           This value must be unique, unless the -o option is used. The value
           must be non-negative. Values between 0 and 999 are typically
           reserved for system accounts.

           The user's mailbox, and any files which the user owns and which are
           located in the user's home directory will have the file user ID
           changed automatically.

           The ownership of files outside of the user's home directory must be
           fixed manually.

       -U, --unlock
           Разблокировать пароль пользователя. Это выполняется удалением
           символа '!' из начала шифрованного пароля. Не используйте этот
           параметр вместе с -p или -L.

           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).

       -Z, --selinux-user SEUSER
           The SELinux user for the user's login. The default is to leave this
           field the blank, which causes the system to select the default
           SELinux user.


ПРЕДОСТЕРЕЖЕНИЯ
       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, but only check if the user is
       logged in according to utmp on other architectures.

       You must change the owner of any crontab files or at jobs manually.

       You must make any changes involving NIS on the NIS server.


CONFIGURATION
       The following configuration variables in /etc/login.defs change the
       behavior of this tool:

       MAIL_DIR (string)
           Почтовый каталог. Данный параметр нужен для управления почтовым
           ящиком при изменении или удалении учётной записи пользователя. Если
           параметр не задан, то используется значение указанное при сборке.

       MAIL_FILE (string)
           Defines the location of the users mail spool files relatively to
           their home directory.

       The MAIL_DIR and MAIL_FILE variables are used by useradd, usermod, and
       userdel to create, move, or delete the user's mail spool.

       MAX_MEMBERS_PER_GROUP (number)
           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).

           The default value is 0, meaning that there are no limits in the
           number of members in a group.

           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.

           If you need to enforce such limit, you can use 25.

           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.


ФАЙЛЫ
       /etc/group
           содержит информацию о группах

       /etc/gshadow
           содержит защищаемую информацию о группах

       /etc/passwd
           содержит информацию о пользователях

       /etc/shadow
           содержит защищаемую информацию о пользователях


СМОТРИТЕ ТАКЖЕ
       chfn(1), chsh(1), passwd(1), crypt(3), gpasswd(8), groupadd(8),
       groupdel(8), groupmod(8), login.defs(5), useradd(8), userdel(8).