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Postgres documentation
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<refentry id="APP-CREATELANG">
 <docinfo>
  <date>2001-05-09</date>
 </docinfo>

 <refmeta>
  <refentrytitle id="APP-CREATELANG-TITLE"><application>createlang</application></refentrytitle>
  <manvolnum>1</manvolnum>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname id="createlang">createlang</refname>
  <refpurpose>define a new <productname>PostgreSQL</productname> procedural language</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <cmdsynopsis>
   <command>createlang</command>
   <arg rep="repeat"><replaceable>connection-options</replaceable></arg>
   <arg><replaceable>langname</replaceable></arg>
   <arg choice="plain"><replaceable>dbname</replaceable></arg>
   <sbr>
   <command>createlang</command>
   <arg rep="repeat"><replaceable>connection-options</replaceable></arg>
   <group choice="plain"><arg>--list</arg><arg>-l</arg></group>
   <arg choice="plain"><replaceable>dbname</replaceable></arg>
  </cmdsynopsis>

  <refsect2 id="R2-APP-CREATELANG-1">
   <title>
    Inputs
   </title>
   <para>
    <application>createlang</application> accepts the following command line arguments:
    
    <variablelist>
     <varlistentry>
      <term><replaceable class="parameter">langname</replaceable></term>
      <listitem>
       <para>
	Specifies the name of the procedural programming language to be
	defined.
	<application>createlang</application> will prompt for
	<replaceable class="parameter">langname</replaceable>
	if it is not specified on the command line.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-d, --dbname <replaceable class="parameter">dbname</replaceable></term>
      <listitem>
       <para>
	Specifies to which database the language should be added.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-e, --echo</term>
      <listitem>
       <para>
        Displays SQL commands as they are executed.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-l, --list</term>
      <listitem>
       <para>
        Shows a list of already installed languages in the target database
        (which must be specified).
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>--L <replaceable class="parameter">directory</replaceable></term>
      <listitem>
       <para>
	Specifies the directory in which the language interpreter is
        to be found.  Use of this option is deprecated; the directory
	is normally found automatically.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </para>

   <para>
    <application>createlang</application> also accepts 
    the following command line arguments for connection parameters:
    
    <variablelist>
     <varlistentry>
      <term>-h, --host <replaceable class="parameter">host</replaceable></term>
      <listitem>
       <para>
	Specifies the hostname of the machine on which the 
	<application>postmaster</application>
	is running.  If host begins with a slash, it is used 
	as the directory for the unix domain socket.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-p, --port <replaceable class="parameter">port</replaceable></term>
      <listitem>
       <para>
	Specifies the Internet TCP/IP port or local Unix domain socket file 
	extension on which the <application>postmaster</application>
	is listening for connections.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-U, --username <replaceable class="parameter">username</replaceable></term>
      <listitem>
       <para>
        Username to connect as.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-W, --password</term>
      <listitem>
       <para>
        Force password prompt.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </para>
  </refsect2>

  <refsect2 id="R2-APP-CREATELANG-2">
   <title>
    Outputs
   </title>
   <para>
    Most error messages are self-explanatory. If not, run
    <application>createlang</application> with the <option>--echo</option>
    option and see under the respective <acronym>SQL</acronym> command
    for details. Check also under <xref linkend="APP-PSQL">
    for more possibilities.
   </para>
  </refsect2>
 </refsynopsisdiv>
 
 <refsect1 id="R1-APP-CREATELANG-1">
  <title>
   Description
  </title>

  <para>
   <application>createlang</application> is a utility for adding a new 
   programming language to a <productname>Postgres</productname> database.
   <application>createlang</application> currently accepts several
   languages, <literal>plpgsql, pltcl, pltclu,</literal> and <literal>
   plperl</literal>.
  </para>
  <para>
   Although backend programming languages can be added directly using
   several <acronym>SQL</acronym> commands, it is recommended to use
   <application>createlang</application> because it performs a number
   of checks and is much easier to use. See
   <xref linkend="sql-createlanguage" endterm="sql-createlanguage-title">
   for more.
  </para>
 </refsect1>

 <refsect1 id="R1-APP-CREATELANG-2">
  <title>
   Notes
  </title>
  <para>
   Use <xref linkend="app-droplang"> to remove a language.
  </para>

  <para>
   <application>createlang</application> is a shell script that invokes
   <application>psql</application> 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.
  </para>
 </refsect1>
 
 <refsect1 id="R1-APP-CREATELANG-3">
  <title>Usage</title>

  <informalexample>
   <para>
    To install <literal>pltcl</literal> into the database
    <literal>template1</literal>:
<screen>
<prompt>$ </prompt><userinput>createlang pltcl template1</userinput>
</screen>
   </para>
  </informalexample>
 </refsect1>
</refentry>

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