# createdb <dbname>

e.g: # createdb testdb

Remove a PostgreSQL database

# dropdb <dbname>

e.g: # dropdb testdb

Backing up a PostgreSQL database

# su - postgres

# pg_dump --blob -Fc testdb -f /var/lib/pgsql/backups/testdb_backup

Restoring PostgreSQL database from back up dump

# pg_restore --dbname=testdb /var/lib/pgsql/backups/testdb_backup

Writing query output to a CSV file:

# \o 'tmp/logs/query_out_dump.csv'

After this operation all the query results will be stored in a CSV file.

Using console again for query output:

# \o

For more on pg_dump and pg_restore pl. check the documentation