This jenkins script looks for a ENV VAR (parameterized via Build Params) defined as *RELEASE*, which if != "No" will Swap the traditional X.Y.Z[-IDENTIFIER] version for X.Y.Zb[BUILD_NUMBER][IDENTIFIER] (with IDENTIFIER being determined based on whether RELEASE is Snapshot or Release)

jenkins-mvn-version.sh

#!/bin/bash

if [[ "$RELEASE" != "No" ]]; then
	if [[ "$RELEASE" == "Release" ]]; then
    	BUILD_SUFFIX=".RELEASE"
    elif [[ "$RELEASE" == "Snapshot" ]]; then
    	BUILD_SUFFIX="-SNAPSHOT"
    fi
	echo "Swapping version for X.X.${BUILD_NUMBER}${BUILD_SUFFIX}"
	sed -i -e "1,/<version>\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*<\/version>/s/<version>\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*<\/version>/<version>\1.\2.\3b${BUILD_NUMBER}${BUILD_SUFFIX}<\/version>/" pom.xml
else
	echo "Not swapping version"
fi