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useradd(8)                                                          useradd(8)

       useradd - create a new user account

       useradd [-D binddn] [-P path] [-c comment] [-d homedir]
               [-e expire] [-f inactive] [-G group,...] [-g gid]
               [-m [-k skeldir]] [-o] [-p password] [-u uid]
               [-U umask] [-r] [-s shell] [--service service] [--help]
               [--usage] [-v] [--preferred-uid uid] account

       useradd --show-defaults

       useradd --save-defaults [-d homedir] [-e expire] [-f inactive]
               [-g gid] [-G group,...] [-k skeldir] [-U umask] [-s shell]

       useradd  creates  a  new  user  account  using  the default values from
       /etc/default/useradd and the specified on the command line.   Depending
       on the command line options the new account will be added to the system
       files or LDAP database, the home directory will be created and the ini-
       tial default files and directories will be copied.

       The  account  name must begin with an alphabetic character and the rest
       of the string should be from the POSIX portable character class ([A-Za-

       -c, --comment comment
              This option specifies the users finger information.

       -d, --home homedir
              This  option  specifies the users home directory.  If not speci-
              fied, the default from /etc/default/useradd is used.

       -e, --expire expire
              With this option the date when the account will be  expired  can
              be  changed.  expiredate  has  to be specified as number of days
              since January 1st, 1970. The date may also be expressed  in  the
              format   YYYY-MM-DD.    If   not  specified,  the  default  from
              /etc/default/useradd is used.

       -f, --inactive inactive
              This option is used to set the  number  of  days  of  inactivity
              after  a  password  has  expired before the account is locked. A
              user whose account is locked must contact the  system   adminis-
              trator  before  being able to use the account again.  A value of
              -1 disables this feature.  If not specified,  the  default  from
              /etc/default/useradd is used.

       -G, --groups group,...
              With  this  option  a list of supplementary groups can be speci-
              fied, which the user should become a member of.  Each  group  is
              separated from the next one only by a comma, without whitespace.
              If not specified, the default from /etc/default/useradd is used.

       -g, --gid gid
              The  group  name  or  number of the user's main group. The group
              name or number must refer to an already existing group.  If  not
              specified, the default from /etc/default/useradd is used.

       -k, --skel skeldir
              Specify  an  alternative  skel  directory.  This  option is only
              valid, if the home directory for the new user should be created,
              too.  If not specified, the default from /etc/default/useradd or
              /etc/skel is used.

       -m, --create-home
              Create home directory for new user account.

       -o, --non-unique
              Allow duplicate (non-unique) User IDs.

       -p, --password password
              Encrypted password as returned by crypt(3) for the new  account.
              The default is to disable the account.

       -U, --umask umask
              The  permission mask is initialized to this value. It is used by
              useradd for creating new home directories. The default is  taken
              from /etc/default/useradd.

       -u, --uid uid
              Force  the new userid to be the given number. This value must be
              positive and unique. The default is to use  the  first  free  ID
              after the greatest used one. The range from which the user ID is
              chosen can be specified in /etc/login.defs.

       --preferred-uid uid
              Set the new userid to the specified value if possible.  If  that
              value  is  already  in  use  the first free ID will be chosen as
              described above.

       -r, --system
              Create a system account. A system account is an user with an UID
              between   SYSTEM_UID_MIN   and   SYSTEM_UID_MAX  as  defined  in
              /etc/login.defs, if no UID is specified.  The  GROUPS  entry  in
              /etc/default/useradd is ignored, too.

       -s, --shell  shell
              Specify user's login shell. The default for normal user accounts
              is taken  from  /etc/default/useradd,  the  default  for  system
              accounts is /bin/false.

       --service service
              Add  the  account  to a special directory. The default is files,
              but ldap is also valid.

       -D, --binddn binddn
              Use the Distinguished Name binddn to bind to the LDAP directory.
              The  user will be prompted for a password for simple authentica-

       -P, --path path
              The passwd and shadow files  are  located  below  the  specified
              directory path. useradd will use this files, not /etc/passwd and

       --help Print a list of valid options with a short description.

              Print a short list of valid options.

       -v, --version
              Print the version number and exit.

       /etc/passwd - user account information
       /etc/shadow - shadow user account information
       /etc/group - group information
       /etc/default/useradd - default values for account creation
       /etc/skel - directory containing default files

       passwd(1), login.defs(5), passwd(5), shadow(5), userdel(8), usermod(8)

       Thorsten Kukuk <kukuk@suse.de>

pwdutils                           May 2010                         useradd(8)

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Gedruckt am: 13.12.2017 10:18 GMT+0100 (2017-12-13T10:18:21+01:00)