Different start-up options for JBoss EAP 6.x, 7.x, and 8.x

Issue

• What are possible options can be used to start JBoss EAP 6 server instance ?
• How to set up a custom location for the domain.xml file under JBOSS_HOME/domain/configuration
• How to run different domain if i run domain.sh. We are using JBoss EAP 6.1.0 version I created two domains like domain1 and domain2 on same machine. Default domain is running if i run ./domain.sh. I want to be run domain2 if i run ./domain.sh with out passing any other parameters like base.dir through the command line. What file we need to modify and where we want to change in domain.sh script file.
• I'm using domain.sh -Djboss.server.base.dir=/jboss/path ...... to startup JBoss, but seems the parameter is not picked up.
• How to enable the system properties with –D option in jboss EAP 6?