OPTIONS

The options which apply to the useradd command are:

-c, --comment COMMENT

Any text string. It is generally a short description of the login, and is currently used as the field for the user's full name.

-b, --base-dir BASE_DIR

The default base directory for the system if -d dir is not specified. BASE_DIR is concatenated with the account name to define the home directory. If the -m option is not used, BASE_DIR must exist.

-d, --home 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 BASE_DIR and use that as the login directory name. The directory HOME_DIR does not have to exist but will not be created if it is missing.

-e, --expiredate EXPIRE_DATE

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

-f, --inactive 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. The default value is -1.

-g, --gid 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. /etc/default/useradd.

-G, --groups GROUP1[,GROUP2,...[,GROUPN]]]

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.

-h, --help

Display help message and exit.

-M

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

-m, --create-home

The user's home directory will be created if it does not exist. The files contained in SKEL_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 directories contained in SKEL_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.

-l

Do not add the user to the last login log file. This is an option added by Red Hat.

-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. When this option is used, users by default will be placed in whatever group is specified in /etc/default/useradd. If no default group is defined, group 1 will be used.

-K, --key KEY=VALUE

Overrides /etc/login.defs defaults (UID_MIN, UID_MAX, UMASK, PASS_MAX_DAYS and others).

Example: -K PASS_MAX_DAYS=-1 can be used when creating system account to turn off password ageing, even though system account has no password at all. Multiple -K options can be specified, e.g.: -K UID_MIN=100 -K UID_MAX=499

Note: -K UID_MIN=10,UID_MAX=499 doesn't work yet.

-o, --non-unique

Allow the creation of a user account with a duplicate (non-unique) UID.

-p, --password PASSWORD

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

-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 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 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 smallest ID value greater than 999 and greater than every other user. Values between 0 and 999 are typically reserved for system accounts.

-Z, --selinux-user SEUSER

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

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 HOME_DIR

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

-e EXPIRE_DATE

The date on which the user account is disabled.

-f INACTIVE

The number of days after a password has expired before the account will be disabled.

-g, --gid 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, --shell 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.  

NOTES

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.  

CAVEATS

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

Similarly, if the username already exists in an external user database such as NIS, useradd will deny the user account creation request.  

FILES

/etc/passwd

User account information.

/etc/shadow

Secure user account information.

/etc/group

Group account information.

/etc/gshadow

Secure group account information.

/etc/default/useradd

Default values for account creation.

/etc/skel/

Directory containing default files.

/etc/login.defs

Shadow password suite configuration.

EXIT VALUES

The useradd command exits with the following values:

0

success

1

can't update password file

2

invalid command syntax

3

invalid argument to option

4

UID already in use (and no -o)

6

specified group doesn't exist

9

username already in use

10

can't update group file

12

can't create home directory

13

can't create mail spool

SEE ALSO

chfn(1), chsh(1), passwd(1), crypt(3), groupadd(8), groupdel(8), groupmod(8), login.defs(5), userdel(8), usermod(8).

Index

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

Changing the default values

NOTES

CAVEATS

FILES

EXIT VALUES

SEE ALSO

Партнёры:

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