Setting Environnemt to new machine to access sqlplus

I have trouble setting enviromnet setting to new systems , want to understand my concepts.
Make me right where i am not plz to clear my concepts.
These are the 3 things we need to set to access sqlpuls
set ORACLE_HOME=<oraclehome>; export ORACLE_HOME
set ORACLE_SID=<SID>; export ORACLE_SID
set PATH=$PATH:/var/oracle/9.2.0/bin
beside these we should check which shell we are using by echo $SHELL
Do we have to set these environment differently in differenet shell? and how we can check the ORACLE_HOME, SID, PATH if we dont know it? and is there any other thing i should set to access DB sqlplus ?

Instead of this just post the error which you are getting while accessing sqlplus. That will be more helpfull to diagnose this.
and how we can check the ORACLE_HOME, SID, PATH if we dont know it?If echo $ORACLE_HOME doesn't return anything it means ORACLE_HOME is not set, so you need to set it before running sqlplus and you must know the path where oracle is installed.
Daljit Singh

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