I'm searching for a more elegant to retrieve JBoss AS / WildFly major version number from command line, independent if server is running or not.

Currently I have:

- Oldest version is 4.2. So 4 is the default value.

- If directory $JBOSS_HOME/standalone exists, version must be >= 7. Change value to 7.

- If $JBOSS_HOME/modules/system/layers/base/io/undertow exists, it's version 8 or upper. Change value to 8.

Now I want to distinguish between 8 and 9. How?

Any better way?

Must be working on Windows and Unix platforms.