I happened to install the Oracle Instant Client (instructions here
[https://chronicler.tech/quickest-way-to-set-up-the-oracle-instant-client-for-sqlplus-access-to-the-oracle-database/]
) to quickly connect to a database using sqlplus.
Problem
After installation, I simply tried to connect to my database as follows:
./sqlplus scott@dbhost:1521/dsoa.revelationtech.com
And got