PostgreSQL 9.1.23 Documentation
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# createlang

## Name

createlang -- install a PostgreSQL procedural language

## Synopsis

`createlang` [`connection-option`...] `langname` [`dbname`]

`createlang` [`connection-option`...] --list | -l `dbname`

## Description

createlang is a utility for adding a procedural language to a PostgreSQL database.

createlang is just a wrapper around the CREATE EXTENSION SQL command.

Caution
createlang is deprecated and may be removed in a future PostgreSQL release. Direct use of the `CREATE EXTENSION` command is recommended instead.

## Options

createlang accepts the following command-line arguments:

`langname`

  Specifies the name of the procedural language to be installed.

`[-d] `dbname``
`[--dbname=]`dbname``

  Specifies the database to which the language should be added. The default is to use the database with the same name as the current system user.

`-e`
`--echo`

  Display SQL commands as they are executed.

`-l`
`--list`

  Show a list of already installed languages in the target database.

`-V`
`--version`

  Print the createlang version and exit.

`-?`
`--help`

  Show help about createlang command line arguments, and exit.

createlang 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.

`-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 createlang to prompt for a password before connecting to a database.

  This option is never essential, since createlang will automatically prompt for a password if the server demands password authentication. However, createlang 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

`PGDATABASE`
`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

Most error messages are self-explanatory. If not, run createlang with the `--echo` option and see the respective SQL command for details. Also, any default connection settings and environment variables used by the libpq front-end library will apply.

## Notes

Use droplang to remove a language.

## Examples

To install the language `pltcl` into the database `template1`:

    $ createlang pltcl template1

Note that installing the language into `template1` will cause it to be automatically installed into subsequently-created databases as well.

## See Also

droplang, CREATE EXTENSION, CREATE LANGUAGE

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