\f ',' \a \t \o /home/john/moocow.csv SELECT foo,bar FROM whatever; \o \q
If a field has newlines, this will break. You can do something like this instead.....
SELECT foo, bar, '"' || REPLACE(REPLACE(field_with_newilne, '\n', '\\n'), '"', '""') || '"'
FROM whatever;
Then you can import the data into another database if needed:
copy whatever(foo,bar) FROM '/home/john/moocow.csv' DELIMITER ',' CSV HEADER;