> sqlplus / as sysdba

SQL> select * from v$version;

BANNER
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Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 – 64bit Production
PL/SQL Release 11.2.0.2.0 – Production
CORE 11.2.0.2.0 Production
TNS for Linux: Version 11.2.0.2.0 – Production
NLSRTL Version 11.2.0.2.0 – Production