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

For completeness, another version using regex rather than string cutting:

psql -l | grep '^ exact_dbname\b'

So for instance:

if psql -l | grep '^ mydatabase\b' > /dev/null ; then
  echo "Database exists already."
  exit
fi