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To do this login to the command line and switch to the main Postgres user. eg su postgres
The type the psql -l command this will produce a list of databases with there encodings
List of databases
Name | Owner | Encoding
------------------------+------------+-----------
DB1 | postgres | UTF8
DB2 | postgres | UTF8
DB3 | postgres | UTF8
DB4 | clicks | SQL_ASCII
DB5 | clicks | SQL_ASCII