Checking Oracle version is quite often task. The simplest method is to login to sqlplus and query V$VERSION view.
sqlplus "/ as sysdba"
SQL> select * from v$version
2 /
BANNER
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Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production PL/SQL Release 11.1.0.6.0 - Production CORE 11.1.0.6.0 Production TNS for 32-bit Windows: Version 11.1.0.6.0 - Production NLSRTL Version 11.1.0.6.0 - Production
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