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postgresql - psql - save results of command to a file

I'm using psql's dt to list all tables in a database and I need to save the results.

What is the syntax to export the results of a psql command to a file?

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From psql's help (?):

o [FILE] send all query results to file or |pipe

The sequence of commands will look like this:

[wist@scifres ~]$ psql db
Welcome to psql 8.3.6, the PostgreSQL interactive terminal

db=>o out.txt
db=>dt
db=>q

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