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RedHat 9 (Linux i386) - man page for adduser (redhat section 8)

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USERADD(8)									       USERADD(8)

       useradd - Create a new user or update default new user information

       useradd [-c comment] [-d home_dir]
	       [-e expire_date] [-f inactive_time]
	       [-g initial_group] [-G group[,...]]
	       [-m [-k skeleton_dir] | -M] [-n] [-o] [-p passwd] [-r]
	       [-s shell] [-u uid] login

       useradd -D [-g default_group] [-b default_home]
	       [-e default_expire_date] [-f default_inactive]
	       [-s default_shell]

   Creating New Users
       When  invoked  without the -D option, the useradd command creates a new user account using
       the values specified on the command line and the default values from the system.  The  new
       user  account  will be entered into the system files as needed, the home directory will be
       created, and initial files copied, depending on the command  line  options.   The  version
       provided  with Red Hat Linux will create a group for each user added to the system, unless
       the -n option is given.	The options which apply to the useradd command are:

       -c comment
	      The new user's password file comment field.

       -d home_dir
	      The new user will be created using home_dir as  the  value  for  the  user's  login
	      directory.  The default is to append the login name to default_home and use that as
	      the login directory name.

       -e expire_date
	      The date on which the user account will be disabled.  The date is specified in  the
	      format YYYY-MM-DD.

       -f inactive_days
	      The  number  of days after a password expires until the account is permanently dis-
	      abled.  A value of 0 disables the account as soon as the password has expired,  and
	      a value of -1 disables the feature.  The default value is -1.

       -g initial_group
	      The  group  name	or number of the user's initial login group.  The group name must
	      exist.  A group number must refer to an already existing group.  The default  group
	      number is 1 or whatever is specified in /etc/default/useradd.

       -G group,[...]
	      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.  The
	      default is for the user to belong only to the initial group.

       -m     The user's home directory will be created if it does not	exist.	 The  files  con-
	      tained  in  skeleton_dir	will  be copied to the home directory if the -k option is
	      used, otherwise the files contained in /etc/skel will be used instead.  Any  direc-
	      tories  contained  in  skeleton_dir or /etc/skel will be created in the user's home
	      directory as well.  The -k option is only valid in conjunction with the -m  option.
	      The default is to not create the directory and to not copy any files.

       -M     The  user home directory will not be created, even if the system wide settings from
	      /etc/login.defs is to create home dirs.

       -n     A group having the same name as the user being added to the system will be  created
	      by default. This option will turn off this Red Hat Linux specific behavior.

       -o     Allow create user with duplicate (non-unique) UID.

       -p passwd
	      The  encrypted  password,  as  returned by crypt(3).  The default is to disable the

       -r     This flag is used to create a system account. That is, a user with a UID lower than
	      the value of UID_MIN defined in /etc/login.defs and whose password does not expire.
	      Note that useradd will not create a home directory for such an user, regardless  of
	      the  default setting in /etc/login.defs.	You have to specify -m option if you want
	      a home directory for a system account to be created.  This is an	option	added  by
	      Red Hat.

       -s shell
	      The  name  of  the  user's  login shell.	The default is to leave this field blank,
	      which causes the system to select the default login shell.

       -u uid The numerical value of the user's ID.  This value must be  unique,  unless  the  -o
	      option  is used.	The value must be non-negative.  The default is to use the small-
	      est ID value greater than 99 and greater than every other user.  Values  between	0
	      and 99 are typically reserved for system accounts.

   Changing the default values
       When  invoked  with the -D option, useradd will either display the current default values,
       or update the default values from the command line.  The valid options are

       -b default_home
	      The initial path prefix for a new user's home directory.	The user's name  will  be
	      affixed  to  the	end  of  default_home  to create the new directory name if the -d
	      option is not used when creating a new account.

       -e default_expire_date
	      The date on which the user account is disabled.

       -f default_inactive
	      The number of days after a password has expired before the  account  will  be  dis-

       -g default_group
	      The  group  name or ID for a new user's initial group.  The named group must exist,
	      and a numerical group ID must have an existing entry .

       -s default_shell
	      The name of the new user's login shell.  The named program will  be  used  for  all
	      future new user accounts.

       If no options are specified, useradd displays the current default values.

       The  system  administrator  is  responsible  for  placing  the  default	user files in the
       /etc/skel directory.
       This version of useradd was modified by Red Hat to suit Red Hat user/group conventions.

       You may not add a user to an NIS group.	This must be performed on the NIS server.

       /etc/passwd - user account information
       /etc/shadow - secure user account information
       /etc/group - group information
       /etc/gshadow - secure group information
       /etc/default/useradd - default information
       /etc/login.defs - system-wide settings
       /etc/skel - directory containing default files

       chfn(1), chsh(1), passwd(1), crypt(3), groupadd(8), groupdel(8), groupmod(8),  userdel(8),

       Julianne Frances Haugh (jockgrrl@ix.netcom.com)

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