Microsoft has introduced a ton of new things in Bash for Linux on Windows 10 v1809. As per the details published by Microsoft, here is that is new with this software component inside of Windows 10 version 1809.
Bash on Windows 10 v1809
You can read more this release on microsoft.com.
If you would learn more about the Bash shell on Windows 10, you can start by learning how to run Bash on Windows 10.