GNU/Linux Desktop Survival Guide by Graham Williams
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Starting iSQLPlus

When trying to log into iSQLPlus (SQLPlus web interface) you may get an error "ERROR - ORA-12162: TNS:net service name is incorrectly specified". When you start iSQLPlus, the ORACLE_HOME and ORACLE_SID environment variables need to be set properly:

  isqlplusctl stop
  ORACLE_HOME=/u01/app/oracle/product/10.1.0/db_1
  ORACLE_SID=test
  export ORACLE_HOME ORACLE_SID
  isqlplusctl start