Also test:
Or use tasklist /m on running sqlplus.exe – check for missing 64-bit modules. file $ORACLE_HOME/bin/sqlplus Output: ELF 64-bit LSB executable, x86-64 oracle client download 64-bit
https://download.oracle.com/otn/software/instantclient/1918000/instantclient-basic-linux.x64-19.18.0.0.0dbru.zip Also test: Or use tasklist /m on running sqlplus