.bash_history not recording host/os command executed from >SQL prompt

Red Hat Enterprise Linux Server release 6.7 (Santiago) is the OS version

$ sqlplus

SQL> !hostname -i
10.3.10.197

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@exaoem01 ~]$ history

...........................
........................
1012 sqlplus
1013 history

From the above example It is evident that any os commands executed from "SQL> " prompt are not recorded not sure why. How can I audit or force these commands to be visible in .bash_history . Appreciate your insight.

Regards/Hissam