Use `psql` to download data as CSV file

Although SQL WorkBench is a handy tool for querying AWS Redshift, we still need to CLI tool for automation.
To install psql on MacOS, we need to

brew install postgresql

Then we could download data without using \copy but only –csv

echo "select * from example" | psql -h my.endpoint.com -p 5439 --csv mydatabase myuser > output.csv