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Ruby-oci8 is a ruby interface for Oracle Database. This is available for all Oracle versions after Oracle 8 including Oracle XE and Oracle Instant Client

As for Oracle7, use Oracle7 Module for Ruby by Yoshida Masato.

connect to scott/tiger, select emp and print as CSV format.

 ruby -r oci8 -e "OCI8.new('scott', 'tiger').exec('select * from emp') do |r| puts r.join(','); end"