[oracle@ora19c ~]$ free --human
               total        used        free      shared  buff/cache   available
Mem:            15Gi       1.1Gi        11Gi       4.0Mi       3.2Gi        14Gi
Swap:          4.0Gi       359Mi       3.6Gi

[oracle@ora19c ~]$ env | grep "^ORACLE_\|^LD_LIBRARY_PATH"
ORACLE_BASE=/u01/app/oracle
ORACLE_HOME=/u01/app/oracle/product/19.0.0/dbhome_1
LD_LIBRARY_PATH=/u01/app/oracle/product/19.0.0/dbhome_1/lib