debug

Jenkinsfile

@@ -83,7 +83,7 @@ pipeline {
                   git clone ${SWARM_GIT_URL} && cd ${SWARM_GIT_NAME}
                   if [ $(git branch --list -a | grep -q ${branch}; echo $?) == 0 ];then echo "${branch} is already exist";git checkout ${branch}; \
                   else echo "${branch} does not exist!!!"; git checkout -b ${branch};fi
-                  echo -n ${SERIAL} > tags/${DOCKER_IMAGE}.version
+                  echo -n \${SERIAL} > tags/${DOCKER_IMAGE}.version
                   git add -A
                   git config --global user.email "${JENKINS_MAIL}"
                   git config --global user.name "Jenkins"