createlang [connection-options...] langname [dbname]
createlang [connection-options...] --list | -l dbname
createlang accepts the following command line arguments:
Specifies the name of the procedural programming language to be defined.
Specifies to which database the language should be added. The default is to use the database with the same name as the current system user.
Displays SQL commands as they are executed.
Shows a list of already installed languages in the target database (which must be specified).
Specifies the directory in which the language interpreter is to be found. The directory is normally found automatically; this option is primarily for debugging purposes.
createlang also accepts the following command line arguments for connection parameters:
Specifies the host name of the machine on which the server is running. If host begins with a slash, it is used as the directory for the Unix domain socket.
Specifies the Internet TCP/IP port or local Unix domain socket file extension on which the server is listening for connections.
User name to connect as
Force password prompt.
Most error messages are self-explanatory. If not, run createlang with the --echo option and see under the respective SQL command for details. Check also under psql for more possibilities.
createlang is a utility for adding a new programming language to a PostgreSQL database. createlang can handle all the languages supplied in the default PostgreSQL distribution, but not languages provided by other parties.
Although backend programming languages can be added directly using several SQL commands, it is recommended to use createlang because it performs a number of checks and is much easier to use. See CREATE LANGUAGE for more.
Use droplang to remove a language.
createlang is a shell script that invokes psql several times. If you have things arranged so that a password prompt is required to connect, you will be prompted for a password several times.