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When you start SQLPlus you should see the Oracle version information. For example:

$ sqlplus fkim/fkim@example

Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production

Also you can execute SQL to retrieve the version information.

SQL> select * from v$version where banner like 'Oracle%';

BANNER
----------------------------------------------------------------
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production

Related posts:

1. ORA-12514 and ORA-27101
2. Catching Oracle exceptions
3. SQL*Plus Commit on Exit
4. Viewing Expert-Level Information in the ACC
5. List users