Database names and pg_dump

We are planning to migrate from Oracle to PostGreSQL, and we would like to replicate our database maintenance procedures/scripts as closely as possible;
Our Oracle backup scripts extract the names of all active SIDs from the /etc/oratab file and perform a backup export for each SID;
Is there an equivalent file or utility that will provide the name of each database within a PostGreSQL cluster?
I know you can extract an entire cluster via pg_dumpall, but we would like to stick with the individual db backups--for file-size issues and restore efficiency.

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David Rickard
Software Engineer
The GTS Companies
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