instantclient21 is available from the OL8 repos here: https://yum.oracle.com/repo/OracleLinux/OL8/oracle/instantclient21/x86_64/getPackage/oracle-instantclient ...
I just installed Oracle instant client and sqlplus again. Here's how to do it: (Update 10/06/2020: Step 1 is no longer necessary, just run the brew commands!)
Download the 64-bit Instant Client Basic Package, SQL*Plus Package, and the Tools Package. For example: As the oracle user, create a new directory for the ...
instantclient-sqlplus-windows.x64-23.8.0.25.04.zip. The SQL*Plus command line tool for SQL and PL/SQL queries. (5,770,276 bytes) (cksum - 3631684712). Tools ...