Permitting a user on UNIX / Linux to use sqlplus

http://databaseoracle.blogspot.co.uk/2006/11/permitting-user-on-unix-linux-to-use.html

1. For any normal user (not a part of "oinstall" / "dba" groups ) to be able to run sqlplus and access an ORACLE database , read/execute permissions are required for these 4 directories :
   1. $ORACLE_HOME/bin
   2. $ORACLE_HOME/lib
   3. $ORACLE_HOME/oracore
   4. $ORACLE_HOME/sqlplus
2. In addition, these 4 parameters should also be set in the user's environment (.profile) :
   1. ORACLE_HOME,
      
   2. LD_LIBRARY_PATH,
      
   3. ORACLE_SID,
      
   4. PATH