List out some major environment variable used in oracle database installation?

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ORACLE_BASE=/u01/app/<installation-directory>
ORACLE_HOME=$ORACLE_BASE/product/11.2.0(for 11g)/dbhome_1
ORACLE_SID=<instance-name>
PATH=$ORACLE_HOME/bin:$PATH
LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATH
TNS_ADMIN=$ORACLE_HOME/network/admin

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