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createuser
PostgreSQL 9.1.24lts2 Documentation
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createuser

Name

createuser -- define a new PostgreSQL user account

Synopsis

createuser [connection-option...] [option...] [username]

Description

createuser creates a new PostgreSQL user (or more precisely, a role). Only superusers and users with CREATEROLE privilege can create new users, so createuser must be invoked by someone who can connect as a superuser or a user with CREATEROLE privilege.

If you wish to create a new superuser, you must connect as a superuser, not merely with CREATEROLE privilege. Being a superuser implies the ability to bypass all access permission checks within the database, so superuserdom should not be granted lightly.

createuser is a wrapper around the SQL command CREATE ROLE. There is no effective difference between creating users via this utility and via other methods for accessing the server.

Options

createuser accepts the following command-line arguments:

username

Specifies the name of the PostgreSQL user to be created. This name must be different from all existing roles in this PostgreSQL installation.

-c number
--connection-limit=number

Set a maximum number of connections for the new user. The default is to set no limit.

-d
--createdb

The new user will be allowed to create databases.

-D
--no-createdb

The new user will not be allowed to create databases.

-e
--echo

Echo the commands that createuser generates and sends to the server.

-E
--encrypted

Encrypts the user's password stored in the database. If not specified, the default password behavior is used.

-i
--inherit

The new role will automatically inherit privileges of roles it is a member of. This is the default.

-I
--no-inherit

The new role will not automatically inherit privileges of roles it is a member of.

-l
--login

The new user will be allowed to log in (that is, the user name can be used as the initial session user identifier). This is the default.

-L
--no-login

The new user will not be allowed to log in. (A role without login privilege is still useful as a means of managing database permissions.)

-N
--unencrypted

Does not encrypt the user's password stored in the database. If not specified, the default password behavior is used.

-P
--pwprompt

If given, createuser will issue a prompt for the password of the new user. This is not necessary if you do not plan on using password authentication.

-r
--createrole

The new user will be allowed to create new roles (that is, this user will have CREATEROLE privilege).

-R
--no-createrole

The new user will not be allowed to create new roles.

-s
--superuser

The new user will be a superuser.

-S
--no-superuser

The new user will not be a superuser.

-V
--version

Print the createuser version and exit.

-?
--help

Show help about createuser command line arguments, and exit.

You will be prompted for a name and other missing information if it is not specified on the command line.

createuser also accepts the following command-line arguments for connection parameters:

-h host
--host=host

Specifies the host name of the machine on which the server is running. If the value begins with a slash, it is used as the directory for the Unix domain socket.

-p port
--port=port

Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.

-U username
--username=username

User name to connect as (not the user name to create).

-w
--no-password

Never issue a password prompt. If the server requires password authentication and a password is not available by other means such as a .pgpass file, the connection attempt will fail. This option can be useful in batch jobs and scripts where no user is present to enter a password.

-W
--password

Force createuser to prompt for a password (for connecting to the server, not for the password of the new user).

This option is never essential, since createuser will automatically prompt for a password if the server demands password authentication. However, createuser will waste a connection attempt finding out that the server wants a password. In some cases it is worth typing -W to avoid the extra connection attempt.

Environment

PGHOST
PGPORT
PGUSER

Default connection parameters

This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Section 31.13).

Diagnostics

In case of difficulty, see CREATE ROLE and psql for discussions of potential problems and error messages. The database server must be running at the targeted host. Also, any default connection settings and environment variables used by the libpq front-end library will apply.

Examples

To create a user joe on the default database server: 

$ createuser joe
Shall the new role be a superuser? (y/n) n
Shall the new role be allowed to create databases? (y/n) n
Shall the new role be allowed to create more new roles? (y/n) n

To create the same user joe using the server on host eden, port 5000, avoiding the prompts and taking a look at the underlying command: 

$ createuser -h eden -p 5000 -S -D -R -e joe
CREATE ROLE joe NOSUPERUSER NOCREATEDB NOCREATEROLE INHERIT LOGIN;

To create the user joe as a superuser, and assign a password immediately: 

$ createuser -P -s -e joe
Enter password for new role: xyzzy
Enter it again: xyzzy
CREATE ROLE joe PASSWORD 'md5b5f5ba1a423792b526f799ae4eb3d59e' SUPERUSER CREATEDB CREATEROLE INHERIT LOGIN;

In the above example, the new password isn't actually echoed when typed, but we show what was typed for clarity. As you see, the password is encrypted before it is sent to the client. If the option --unencrypted is used, the password will appear in the echoed command (and possibly also in the server log and elsewhere), so you don't want to use -e in that case, if anyone else can see your screen.

See Also

dropuser, CREATE ROLE
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