Importance of local bin directory while running root.sh

Hi All,
Good morning. While running root.sh as root during binary installation (any 
version), the questions below come up. What is the importance of 
/usr/local/bin? My understanding is that the value should be the 
$ORACLE_HOME/bin instead of /usr/local/bin. Am I right? When there are many 
ORACLE_HOME with different versions(lets say 9i, 10g and 11g), what impact does 
it have on the setting of local bin directory location? Ideally speaking, do I 
have to set them to their respective $ORACLE_HOME/bin ? Many Thanks for your 
help.

# /opt/oracle/products/9208/root.sh
Running Oracle9 root.sh script...
The following environment variables are set as:
    ORACLE_OWNER= oracle
    ORACLE_HOME=  /opt/oracle/products/9208
Enter the full pathname of the local bin directory: [/usr/local/bin]:
The file "dbhome" already exists in /usr/local/bin.  Overwrite it? (y/n) [n]:
The file "oraenv" already exists in /usr/local/bin.  Overwrite it? (y/n) [n]: y
   Copying oraenv to /usr/local/bin ...
The file "coraenv" already exists in /usr/local/bin.  Overwrite it? (y/n) [n]: y
   Copying coraenv to /usr/local/bin ...
Adding entry to /var/opt/oracle/oratab file...
Entries will be added to the /var/opt/oracle/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root.sh script.
Now product-specific root actions will be performed.

--Sundar

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