How can I allow users to access SQLPLUS?

Hi everyone,
I have been charged with the task of creating an Oracle server on a CentOS VM. Installation and configuration is complete and SQL is working fine for the database admin user "oracle." I copied the environment variables to the .bashrc file for "oracle" and SQLPLUS starts without a hitch.
Here is where I need a little guidance...
I need to create basic Linux user accounts that will have access to the database, so they can then in turn log into their SQLPLUS accounts. The problem is, all of the database files and software are in located in the user "oracle's" directory. This means that no one but "oracle" and root have access to these files because they are the only ones with proper permissions.
Before I put a ton of time into this, I thought I would pose these questions to the Oracle Linux community:
1) Could I enable a specific Linux group (ex. "Oracle Users") to have access to the main database folder or possibly all folders along the path? I am hoping this would allow any users I put in the group access to the folders, and essentially the SQLPLUS application. (here is ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_1)
2) If that is not an option, will I need to make a completely new database and locate it in a location that all users can access?
I understand that my first idea may not be the SAFEST method, but this is only for a small class of students learning how to use SQL and writing queries. There will be no sensitive information at risk. This would be a quick fix until I learned more about Oracle and how to use it.
Thank you everyone.

It certainly is rather a question for the General Database forum, though I doubt you will get a lot of happy replies for such a basic question.
You can use / as sysdba OS authentication through SSH or using the server console, provided the user's account belongs to the "dba" user group. For remote connection through sqlnet you need create a $ORACLE_HOME/dbs/orapw$SID password file.
If you would like to know more about this:
Connecting / as sysdba is used for OS authentication. It ignores password credentials stored in the database and allows any user belonging to the OSDBA system group to connect to the database. Connections as sysdba will always connect to the SYS schema of the database, regardless of any username or password specified. Using OS authentication relies on the BEQ protocol, which connects to the database directly, without using the Oracle Listener process.
The "oinstall" group will give access to the database software repository. There could be different oracle home installations, each with a different oracle user/owner like "oracle_prod1" and "oracle_prod2", but both users must be able to read/write the shared oraInventory, in which case both users must have read and write access to the oraInventory directory, hence the oinstall group.

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