diff --git a/README.md b/README.md
index 883f30a..1190163 100644
--- a/README.md
+++ b/README.md
@@ -20,9 +20,7 @@ This is the open source implementation of the [LinkeData.Center SDaaS™ product
 
 ```
 docker compose up -d --build
-docker compose exec cli sdaas
-bats tests/{unit,functional,system}
-exit
+docker compose exec cli sdaas bats tests/{unit,functional,system}
 docker compose down
 ```
 
@@ -92,10 +90,10 @@ To push a new docker image to docker hub:
 ```
 docker login
 # input the docker hub credentials...
-VERSION="4.0.0-rc1"
-docker build -t linkeddatacenter/sdaas-ce:4.0.0-rc1 .
-docker tag linkeddatacenter/sdaas-ce:4.0.0-rc1 linkeddatacenter/sdaas-ce 
-docker push linkeddatacenter/sdaas-ce:4.0.0-rc1
+VERSION="4.0.0-rc2"
+docker build -t linkeddatacenter/sdaas-ce:$VERSION .
+docker tag linkeddatacenter/sdaas-ce:$VERSION linkeddatacenter/sdaas-ce 
+docker push linkeddatacenter/sdaas-ce:$VERSION
 docker push linkeddatacenter/sdaas-ce:latest
 ```
 
diff --git a/modules/core b/modules/core
index 2e4aed0..3000331 100644
--- a/modules/core
+++ b/modules/core
@@ -107,6 +107,13 @@ sd_abort() {
 	exit 2
 }
 
+sd_return_first_non_zero() {
+	for element in "$@"; do
+		if [[ $element -ne 0 ]]; then
+			return $element
+		fi
+	done
+}
 
 sd_include() {	
 	local forceFlag=0
diff --git a/tests/unit/coreTest.bats b/tests/unit/coreTest.bats
index 24c1c70..257d09c 100644
--- a/tests/unit/coreTest.bats
+++ b/tests/unit/coreTest.bats
@@ -119,3 +119,21 @@ function teardown {
 	[ "$status" -eq 0 ]
 	[[ "${lines[0]}" == "http%3A%2F%2Fw3.org%2F%3Ftest%23name" ]]
 }
+
+
+########## sd_return_first_non_zero
+
+@test "sd_return_first_non_zero" {
+	
+	#run sd_return_first_non_zero 0 
+	#[ "$status" -eq 0 ]
+
+	run sd_return_first_non_zero 0 0 0 0
+	[ "$status" -eq 0 ]
+	
+	run sd_return_first_non_zero 0 1 2 3
+	[ "$status" -eq 1 ]
+	
+	run sd_return_first_non_zero 0 0 2 3
+	[ "$status" -eq 2 ]
+}