Check if database exists in PostgreSQL using shell

Question

I was wondering if anyone would be able to tell me about whether it is possible to use shell to check if a PostgreSQL database exists?

I am making a shell script and

Answer 1

The following shell code seems to work for me:

if [ "$( psql -tAc "SELECT 1 FROM pg_database WHERE datname='DB_NAME'" )" = '1' ]
then
    echo "Database already exists"
else
    echo "Database does not exist"
fi