How To Install Extension Via Script File?

Hi all,

I have a database that uses the ltree extension. I typically create a new
database like so (as a normal user), using my script file:

CREATE DATABASE mydb WITH TEMPLATE template0 ENCODING 'UTF8';

And then su to postgres, login and install the ltree extension on mydb.
Then I logout of my psql instance and re-run the script (as a normal user)
to create the tables & views on mydb. I comment out the table/view
creation portion until I finish the first couple steps, and then uncomment
the tables and views on the 2nd run. Otherwise the script will fail
because the ltree extension has to be installed as a superuser.

I want a script something like:
CREATE DATABASE mydb WITH TEMPLATE template0 ENCODING 'UTF8';
\c mydb
CREATE EXTENSION ltree;
CREATE TABLE mytable(myfields);
rinse, repeat for additional tables and views.

And to be able to run it from the Bash prompt (as securely as possible).

I thought I could add the commands and run the create script by doing:
sudo -u postgres psql -U user -W -d mydb
--file=/home/user/dev/mydb_create.sql

I thought that, running my script as the superuser, it would have the
privileges necessary to install the extension, but I still got a
"permission denied" error.

I did create a password for my postgres user (hence the -W option). And
this is on a local box.

How can I run my script?

Thanks!
Don
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