How do I use text script containing SQL?

I want to build my tables by placing all the sql
statements in a file. What is the correct way to use
this file with psql?

Example: My text file has this in it:

CREATE TABLE table1 (  table1_id serial,  field1  char(5),  PRIMARY KEY (table1_id)
);

I want to be able to use the file to create my table.
I've tried psql -d databasename -e < filename.txt
but that doesn't work.

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