diff --git a/openvidu-server/deployments/ce/docker-compose/install_openvidu.sh b/openvidu-server/deployments/ce/docker-compose/install_openvidu.sh
index 475539be..305f5549 100755
--- a/openvidu-server/deployments/ce/docker-compose/install_openvidu.sh
+++ b/openvidu-server/deployments/ce/docker-compose/install_openvidu.sh
@@ -72,7 +72,7 @@ new_ov_installation() {
      printf '\n     $ ./openvidu start'
      printf '\n'
      printf '\n     For more information, check:'
-     printf "\n     https://docs.openvidu.io/en/${OPENVIDU_VERSION//v}/deployment/deploying-on-premises/"
+     printf '\n     https://docs.openvidu.io/en/%s/deployment/deploying-on-premises/' "${OPENVIDU_VERSION//v}"
      printf '\n'
      printf '\n'
      exit 0
@@ -158,7 +158,7 @@ upgrade_ov() {
      printf "\n          => Moving to 'tmp' folder..."
      printf '\n'
      cd "${TMP_FOLDER}" || fatal_error "Error when moving to 'tmp' folder"
-     docker-compose pull | true
+     docker-compose pull || true
 
      printf '\n     => Stopping Openvidu...'
      printf '\n'
@@ -167,7 +167,7 @@ upgrade_ov() {
      printf "\n          => Moving to 'openvidu' folder..."
      printf '\n'
      cd "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error when moving to 'openvidu' folder"
-     docker-compose down | true
+     docker-compose down || true
 
      printf '\n'
      printf '\n     => Moving to working dir...'
@@ -179,7 +179,7 @@ upgrade_ov() {
      mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml" "${ROLL_BACK_FOLDER}" || fatal_error "Error while moving previous 'docker-compose.yml'"
      printf '\n          - docker-compose.yml'
 
-     if [ ! -z "${USE_OV_CALL}" ]; then
+     if [ -n "${USE_OV_CALL}" ]; then
           mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.override.yml" "${ROLL_BACK_FOLDER}" || fatal_error "Error while moving previous 'docker-compose.override.yml'"
           printf '\n          - docker-compose.override.yml'
      fi
@@ -201,7 +201,7 @@ upgrade_ov() {
      mv "${TMP_FOLDER}/docker-compose.yml" "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error while updating 'docker-compose.yml'"
      printf '\n          - docker-compose.yml'
 
-     if [ ! -z "${USE_OV_CALL}" ]; then
+     if [ -n "${USE_OV_CALL}" ]; then
           mv "${TMP_FOLDER}/docker-compose.override.yml" "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error while updating 'docker-compose.override.yml'"
           printf '\n          - docker-compose.override.yml'
      else
@@ -224,7 +224,7 @@ upgrade_ov() {
 
      # Define old mode: On Premise or Cloud Formation
      OLD_MODE=$(grep -E "Installation Mode:.*$" "${ROLL_BACK_FOLDER}/docker-compose.yml" | awk '{ print $4,$5 }')
-     [ ! -z "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml"
+     [ -n "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml"
 
      # Ready to use
      printf '\n'
@@ -249,8 +249,8 @@ upgrade_ov() {
      printf "\n     If you want to rollback, all the files from the previous installation have been copied to folder '.old-%s'" "${OPENVIDU_PREVIOUS_VERSION}"
      printf '\n'
      printf '\n     For more information, check:'
-     printf "\n     https://docs.openvidu.io/en/${OPENVIDU_VERSION//v}/deployment/deploying-on-premises/"
-     printf "\n     https://docs.openvidu.io/en/${OPENVIDU_VERSION//v}/deployment/upgrading/"
+     printf '\n     https://docs.openvidu.io/en/%s/deployment/deploying-on-premises/' "${OPENVIDU_VERSION//v}"
+     printf '\n     https://docs.openvidu.io/en/%s/deployment/upgrading/' "${OPENVIDU_VERSION//v}"
      printf '\n'
      printf '\n'
 }
@@ -273,7 +273,7 @@ else
 fi
 
 # Check type of installation
-if [[ ! -z "$1" && "$1" == "upgrade" ]]; then
+if [[ -n "$1" && "$1" == "upgrade" ]]; then
      upgrade_ov
 else
      new_ov_installation
diff --git a/openvidu-server/deployments/ce/docker-compose/openvidu b/openvidu-server/deployments/ce/docker-compose/openvidu
index 852ad638..24320c50 100755
--- a/openvidu-server/deployments/ce/docker-compose/openvidu
+++ b/openvidu-server/deployments/ce/docker-compose/openvidu
@@ -28,7 +28,7 @@ collect_basic_information() {
   OV_VERSION=$(grep 'Openvidu Version:' "${OV_FOLDER}/docker-compose.yml" | awk '{ print $4 }')
   CONTAINERS=$(docker ps | awk '{if(NR>1) print $NF}')
 
-  if [ ! -z "$(grep -E '^        image: openvidu/openvidu-call:.*$' "${OV_FOLDER}/docker-compose.override.yml" | tr -d '[:space:]')" ]; then
+  if [ -n "$(grep -E '^        image: openvidu/openvidu-call:.*$' "${OV_FOLDER}/docker-compose.override.yml" | tr -d '[:space:]')" ]; then
     OV_CALL_VERSION=$(grep -E 'Openvidu-Call Version:' "${OV_FOLDER}/docker-compose.override.yml" | awk '{ print $4 }')
   fi
   [ -z "${OV_CALL_VERSION}" ] && OV_CALL_VERSION="No present"
@@ -150,10 +150,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ---------------------------------------"
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker logs $CONTAINER
+      docker logs "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'
@@ -177,10 +177,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ======================================="
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker exec $CONTAINER env
+      docker exec "$CONTAINER" env
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'
@@ -245,7 +245,7 @@ case $1 in
     ;;
 
   kms-logs)
-    kurento_logs $2
+    kurento_logs "$2"
     ;;
 
   upgrade)
diff --git a/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/install_openvidu_pro.sh b/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/install_openvidu_pro.sh
index f4111913..7ab83d09 100755
--- a/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/install_openvidu_pro.sh
+++ b/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/install_openvidu_pro.sh
@@ -124,7 +124,7 @@ new_ov_installation() {
      printf "\n     CAUTION: The folder 'openvidu/elasticsearch' use user and group 1000 permissions. "
      printf "\n     This folder is necessary for store elasticsearch data."
      printf "\n     For more information, check:"
-     printf "\n     https://docs.openvidu.io/en/${OPENVIDU_VERSION//v}/openvidu-pro/deployment/on-premises/#deployment-instructions"
+     printf '\n     https://docs.openvidu.io/en/%s/openvidu-pro/deployment/on-premises/#deployment-instructions' "${OPENVIDU_VERSION//v}"
      printf '\n'
      printf '\n'
      exit 0
@@ -132,13 +132,13 @@ new_ov_installation() {
 
 get_previous_env_variable() {
      local ENV_VARIABLE_NAME=$1
-     echo $(grep -E "${ENV_VARIABLE_NAME}=.*$" "${OPENVIDU_PREVIOUS_FOLDER}/.env" | cut -d'=' -f2)
+     echo "$(grep -E "${ENV_VARIABLE_NAME}=.*$" "${OPENVIDU_PREVIOUS_FOLDER}/.env" | cut -d'=' -f2)"
 }
 
 replace_variable_in_new_env_file() {
      local ENV_VARIABLE_NAME=$1
      local ENV_VARIABLE_VALUE=$2
-     [[ ! -z "${ENV_VARIABLE_VALUE}" ]] && sed -i "s|#${ENV_VARIABLE_NAME}=|${ENV_VARIABLE_NAME}=${ENV_VARIABLE_VALUE}|" "${OPENVIDU_PREVIOUS_FOLDER}/.env-${OPENVIDU_VERSION}"
+     [[ -n "${ENV_VARIABLE_VALUE}" ]] && sed -i "s|#${ENV_VARIABLE_NAME}=|${ENV_VARIABLE_NAME}=${ENV_VARIABLE_VALUE}|" "${OPENVIDU_PREVIOUS_FOLDER}/.env-${OPENVIDU_VERSION}"
 }
 
 upgrade_ov() {
@@ -242,7 +242,7 @@ upgrade_ov() {
      printf '\n'
      cd "${TMP_FOLDER}" || fatal_error "Error when moving to 'tmp' folder"
      printf '\n'
-     docker-compose pull | true
+     docker-compose pull || true
 
      printf '\n     => Stopping Openvidu...'
      printf '\n'
@@ -252,7 +252,7 @@ upgrade_ov() {
      printf '\n'
      cd "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error when moving to 'openvidu' folder"
      printf '\n'
-     docker-compose down | true
+     docker-compose down || true
 
      printf '\n'
      printf '\n     => Moving to working dir...'
@@ -264,7 +264,7 @@ upgrade_ov() {
      mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml" "${ROLL_BACK_FOLDER}" || fatal_error "Error while moving previous 'docker-compose.yml'"
      printf '\n          - docker-compose.yml'
 
-     if [ ! -z "${USE_OV_CALL}" ]; then
+     if [ -n "${USE_OV_CALL}" ]; then
           mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.override.yml" "${ROLL_BACK_FOLDER}" || fatal_error "Error while moving previous 'docker-compose.override.yml'"
           printf '\n          - docker-compose.override.yml'
      fi
@@ -292,7 +292,7 @@ upgrade_ov() {
      mv "${TMP_FOLDER}/docker-compose.yml" "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error while updating 'docker-compose.yml'"
      printf '\n          - docker-compose.yml'
 
-     if [ ! -z "${USE_OV_CALL}" ]; then
+     if [ -n "${USE_OV_CALL}" ]; then
           mv "${TMP_FOLDER}/docker-compose.override.yml" "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error while updating 'docker-compose.override.yml'"
           printf '\n          - docker-compose.override.yml'
      else
@@ -345,16 +345,16 @@ upgrade_ov() {
 
      # Define old mode: On Premise or Cloud Formation
      OLD_MODE=$(grep -E "Installation Mode:.*$" "${ROLL_BACK_FOLDER}/docker-compose.yml" | awk '{ print $4,$5 }')
-     [ ! -z "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml"
+     [ -n "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml"
 
      # Update .env variables to new .env-version
      AWS_REGION=$(get_previous_env_variable AWS_DEFAULT_REGION)
-     if [[ ! -z ${AWS_REGION} ]]; then
+     if [[ -n ${AWS_REGION} ]]; then
 
           # Get new AMI ID
           NEW_AMI_ID=$(curl https://s3-eu-west-1.amazonaws.com/aws.openvidu.io/CF-OpenVidu-Pro-${OPENVIDU_VERSION//v}.yaml --silent |
                          sed -n -e '/KMSAMIMAP:/,/Metadata:/ p' |
-                         grep -A 1 ${AWS_REGION} | grep AMI | tr -d " " | cut -d":" -f2)
+                         grep -A 1 "${AWS_REGION}" | grep AMI | tr -d " " | cut -d":" -f2)
           [[ -z ${NEW_AMI_ID} ]] && fatal_error "Error while getting new AWS_IMAGE_ID for Media Nodes"
 
           # Get previous values
@@ -430,7 +430,7 @@ else
 fi
 
 # Check type of installation
-if [[ ! -z "$1" && "$1" == "upgrade" ]]; then
+if [[ -n "$1" && "$1" == "upgrade" ]]; then
      upgrade_ov
 else
      new_ov_installation
diff --git a/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/openvidu b/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/openvidu
index b5a1462e..0551d4d7 100755
--- a/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/openvidu
+++ b/openvidu-server/deployments/pro/docker-compose/aws-asg-openvidu-server-pro/openvidu
@@ -28,7 +28,7 @@ collect_basic_information() {
   OV_VERSION=$(grep 'Openvidu Version:' "${OV_FOLDER}/docker-compose.yml" | awk '{ print $4 }')
   CONTAINERS=$(docker ps | awk '{if(NR>1) print $NF}')
 
-  if [ ! -z "$(grep -E '^        image: openvidu/openvidu-call:.*$' "${OV_FOLDER}/docker-compose.override.yml" | tr -d '[:space:]')" ]; then
+  if [ -n "$(grep -E '^        image: openvidu/openvidu-call:.*$' "${OV_FOLDER}/docker-compose.override.yml" | tr -d '[:space:]')" ]; then
     OV_CALL_VERSION=$(grep -E 'Openvidu-Call Version:' "${OV_FOLDER}/docker-compose.override.yml" | awk '{ print $4 }')
   fi
   [ -z "${OV_CALL_VERSION}" ] && OV_CALL_VERSION="No present"
@@ -150,10 +150,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ---------------------------------------"
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker logs $CONTAINER
+      docker logs "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'
@@ -167,10 +167,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ======================================="
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker exec $CONTAINER env
+      docker exec "$CONTAINER" env
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'
diff --git a/openvidu-server/deployments/pro/docker-compose/media-node/install_media_node.sh b/openvidu-server/deployments/pro/docker-compose/media-node/install_media_node.sh
index 7a42d429..4e729598 100755
--- a/openvidu-server/deployments/pro/docker-compose/media-node/install_media_node.sh
+++ b/openvidu-server/deployments/pro/docker-compose/media-node/install_media_node.sh
@@ -22,10 +22,10 @@ fatal_error() {
 docker_command_by_container_image() {
   IMAGE_NAME=$1
   COMMAND=$2
-  if  [[ ! -z "${IMAGE_NAME}" ]]; then
-    CONTAINERS=$(docker ps -a | grep "${IMAGE_NAME}" | awk '{print $1}')
-    for CONTAINER_ID in ${CONTAINERS[@]}; do
-      if [[ ! -z "${CONTAINER_ID}" ]] && [[ ! -z "${COMMAND}" ]]; then
+  if  [[ -n "${IMAGE_NAME}" ]]; then
+    CONTAINERS="$(docker ps -a | grep "${IMAGE_NAME}" | awk '{print $1}')"
+    for CONTAINER_ID in $CONTAINERS; do
+      if [[ -n "${CONTAINER_ID}" ]] && [[ -n "${COMMAND}" ]]; then
         bash -c "docker ${COMMAND} ${CONTAINER_ID}"
       fi
     done
@@ -35,7 +35,7 @@ docker_command_by_container_image() {
 
 stop_containers() {
   printf "Stopping containers..."
-  for IMAGE in ${IMAGES[@]}; do
+  for IMAGE in "${IMAGES[@]}"; do
     docker_command_by_container_image "${IMAGE}" "rm -f"
   done
 }
@@ -89,15 +89,15 @@ new_media_node_installation() {
      # Pull images
      printf "\n     => Pulling images...\n"
      cd "${MEDIA_NODE_FOLDER}" || fatal_error "Error when moving to '${MEDIA_NODE_FOLDER}' folder"
-     KMS_IMAGE=$(cat docker-compose.yml | grep KMS_IMAGE | cut -d"=" -f2)
-     METRICBEAT_IMAGE=$(cat docker-compose.yml | grep METRICBEAT_IMAGE | cut -d"=" -f2)
-     FILEBEAT_IMAGE=$(cat docker-compose.yml | grep FILEBEAT_IMAGE | cut -d"=" -f2)
-     OPENVIDU_RECORDING_IMAGE=$(cat docker-compose.yml | grep OPENVIDU_RECORDING_IMAGE | cut -d"=" -f2)
-     docker pull $KMS_IMAGE || fatal "Error while pulling docker image: $KMS_IMAGE"
-     docker pull $METRICBEAT_IMAGE || fatal "Error while pulling docker image: $METRICBEAT_IMAGE"
-     docker pull $FILEBEAT_IMAGE || fatal "Error while pulling docker image: $FILEBEAT_IMAGE"
-     docker pull $OPENVIDU_RECORDING_IMAGE || fatal "Error while pulling docker image: $OPENVIDU_RECORDING_IMAGE"
-     docker-compose pull | true
+     KMS_IMAGE=$(grep KMS_IMAGE docker-compose.yml | cut -d"=" -f2)
+     METRICBEAT_IMAGE=$(grep METRICBEAT_IMAGE docker-compose.yml | cut -d"=" -f2)
+     FILEBEAT_IMAGE=$(grep FILEBEAT_IMAGE docker-compose.yml | cut -d"=" -f2)
+     OPENVIDU_RECORDING_IMAGE=$(grep OPENVIDU_RECORDING_IMAGE docker-compose.yml | cut -d"=" -f2)
+     docker pull "$KMS_IMAGE" || fatal "Error while pulling docker image: $KMS_IMAGE"
+     docker pull "$METRICBEAT_IMAGE" || fatal "Error while pulling docker image: $METRICBEAT_IMAGE"
+     docker pull "$FILEBEAT_IMAGE" || fatal "Error while pulling docker image: $FILEBEAT_IMAGE"
+     docker pull "$OPENVIDU_RECORDING_IMAGE" || fatal "Error while pulling docker image: $OPENVIDU_RECORDING_IMAGE"
+     docker-compose pull || true
 
      # Ready to use
      printf "\n"
@@ -122,7 +122,7 @@ new_media_node_installation() {
      printf '\n     4. Start or restart OpenVidu Pro and all containers will be provisioned'
      printf '\n     automatically to all the media nodes configured in "KMS_URIS"'
      printf '\n     More info about Media Nodes deployment here:'
-     printf "\n     --> https://docs.openvidu.io/en/${OPENVIDU_VERSION//v}/openvidu-pro/deployment/on-premises/#set-the-number-of-media-nodes-on-startup"
+     printf '\n     --> https://docs.openvidu.io/en/%s/openvidu-pro/deployment/on-premises/#set-the-number-of-media-nodes-on-startup' "${OPENVIDU_VERSION//v}"
      printf '\n'
      printf '\n'
      printf "\n     If you want to rollback, all the files from the previous installation have been copied to folder '.old-%s'" "${OPENVIDU_PREVIOUS_VERSION}"
@@ -222,15 +222,15 @@ upgrade_media_node() {
 
      # Pull images
      printf "\n     => Pulling images...\n"
-     KMS_IMAGE=$(cat docker-compose.yml | grep KMS_IMAGE | cut -d"=" -f2)
-     METRICBEAT_IMAGE=$(cat docker-compose.yml | grep METRICBEAT_IMAGE | cut -d"=" -f2)
-     FILEBEAT_IMAGE=$(cat docker-compose.yml | grep FILEBEAT_IMAGE | cut -d"=" -f2)
-     OPENVIDU_RECORDING_IMAGE=$(cat docker-compose.yml | grep OPENVIDU_RECORDING_IMAGE | cut -d"=" -f2)
-     docker pull $KMS_IMAGE || fatal "Error while pulling docker image: $KMS_IMAGE"
-     docker pull $METRICBEAT_IMAGE || fatal "Error while pulling docker image: $METRICBEAT_IMAGE"
-     docker pull $FILEBEAT_IMAGE || fatal "Error while pulling docker image: $FILEBEAT_IMAGE"
-     docker pull $OPENVIDU_RECORDING_IMAGE || fatal "Error while pulling docker image: $OPENVIDU_RECORDING_IMAGE"
-     docker-compose pull | true
+     KMS_IMAGE="$(grep KMS_IMAGE docker-compose.yml | cut -d"=" -f2)"
+     METRICBEAT_IMAGE="$(grep METRICBEAT_IMAGE docker-compose.yml | cut -d"=" -f2)"
+     FILEBEAT_IMAGE="$(grep FILEBEAT_IMAGE docker-compose.yml | cut -d"=" -f2)"
+     OPENVIDU_RECORDING_IMAGE="$(grep OPENVIDU_RECORDING_IMAGE docker-compose.yml | cut -d"=" -f2)"
+     docker pull "$KMS_IMAGE" || fatal "Error while pulling docker image: $KMS_IMAGE"
+     docker pull "$METRICBEAT_IMAGE" || fatal "Error while pulling docker image: $METRICBEAT_IMAGE"
+     docker pull "$FILEBEAT_IMAGE" || fatal "Error while pulling docker image: $FILEBEAT_IMAGE"
+     docker pull "$OPENVIDU_RECORDING_IMAGE" || fatal "Error while pulling docker image: $OPENVIDU_RECORDING_IMAGE"
+     docker-compose pull || true
 
      printf '\n     => Stopping Media Node...'
      printf '\n'
@@ -239,7 +239,7 @@ upgrade_media_node() {
      printf "\n          => Moving to 'openvidu' folder..."
      printf '\n'
      cd "${MEDIA_NODE_PREVIOUS_FOLDER}" || fatal_error "Error when moving to 'openvidu' folder"
-     docker-compose down | true
+     docker-compose down || true
 
      printf '\n'
      printf '\n     => Moving to working dir...'
@@ -290,7 +290,7 @@ upgrade_media_node() {
 
      # Define old mode: On Premise or Cloud Formation
      OLD_MODE=$(grep -E "Installation Mode:.*$" "${ROLL_BACK_FOLDER}/docker-compose.yml" | awk '{ print $4,$5 }')
-     [ ! -z "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${MEDIA_NODE_PREVIOUS_FOLDER}/docker-compose.yml"
+     [ -n "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${MEDIA_NODE_PREVIOUS_FOLDER}/docker-compose.yml"
 
      # Ready to use
      printf '\n'
@@ -317,7 +317,7 @@ upgrade_media_node() {
      printf '\n     5. Start or restart OpenVidu Pro and all containers will be provisioned'
      printf '\n     automatically to all the media nodes configured in "KMS_URIS"'
      printf '\n     More info about Media Nodes deployment here:'
-     printf "\n     --> https://docs.openvidu.io/en/${OPENVIDU_VERSION//v}/openvidu-pro/deployment/on-premises/#set-the-number-of-media-nodes-on-startup"
+     printf '\n     --> https://docs.openvidu.io/en/%s/openvidu-pro/deployment/on-premises/#set-the-number-of-media-nodes-on-startup' "${OPENVIDU_VERSION//v}"
      printf '\n'
      printf '\n'
      printf "\n     If you want to rollback, all the files from the previous installation have been copied to folder '.old-%s'" "${OPENVIDU_PREVIOUS_VERSION}"
@@ -342,7 +342,7 @@ else
 fi
 
 # Check type of installation
-if [[ ! -z "$1" && "$1" == "upgrade" ]]; then
+if [[ -n "$1" && "$1" == "upgrade" ]]; then
      upgrade_media_node
 else
      new_media_node_installation
diff --git a/openvidu-server/deployments/pro/docker-compose/media-node/media_node b/openvidu-server/deployments/pro/docker-compose/media-node/media_node
index 118ee4f9..3cc79bc0 100755
--- a/openvidu-server/deployments/pro/docker-compose/media-node/media_node
+++ b/openvidu-server/deployments/pro/docker-compose/media-node/media_node
@@ -11,10 +11,10 @@ IMAGES=(
 docker_command_by_container_image() {
   IMAGE_NAME=$1
   COMMAND=$2
-  if  [[ ! -z "${IMAGE_NAME}" ]]; then
-    CONTAINERS=$(docker ps -a | grep "${IMAGE_NAME}" | awk '{print $1}')
-    for CONTAINER_ID in ${CONTAINERS[@]}; do
-      if [[ ! -z "${CONTAINER_ID}" ]] && [[ ! -z "${COMMAND}" ]]; then
+  if  [[ -n "${IMAGE_NAME}" ]]; then
+    CONTAINERS="$(docker ps -a | grep "${IMAGE_NAME}" | awk '{print $1}')"
+    for CONTAINER_ID in $CONTAINERS; do
+      if [[ -n "${CONTAINER_ID}" ]] && [[ -n "${COMMAND}" ]]; then
         bash -c "docker ${COMMAND} ${CONTAINER_ID}"
       fi
     done
@@ -24,7 +24,7 @@ docker_command_by_container_image() {
 
 stop_containers() {
   printf "Stopping containers..."
-  for IMAGE in ${IMAGES[@]}; do
+  for IMAGE in "${IMAGES[@]}"; do
     docker_command_by_container_image "${IMAGE}" "rm -f"
   done
 }
@@ -167,10 +167,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ---------------------------------------"
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker logs $CONTAINER
+      docker logs "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'
@@ -194,10 +194,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ======================================="
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker exec $CONTAINER env
+      docker exec "$CONTAINER" env
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'
@@ -257,7 +257,7 @@ case $1 in
     ;;
 
   kms-logs)
-    kurento_logs $2
+    kurento_logs "$2"
     ;;
 
   upgrade)
diff --git a/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/install_openvidu_pro.sh b/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/install_openvidu_pro.sh
index f4ef5396..00d925b8 100755
--- a/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/install_openvidu_pro.sh
+++ b/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/install_openvidu_pro.sh
@@ -124,7 +124,7 @@ new_ov_installation() {
      printf "\n     CAUTION: The folder 'openvidu/elasticsearch' use user and group 1000 permissions. "
      printf "\n     This folder is necessary for store elasticsearch data."
      printf "\n     For more information, check:"
-     printf "\n     https://docs.openvidu.io/en/${OPENVIDU_VERSION//v}/openvidu-pro/deployment/on-premises/#deployment-instructions"
+     printf '\n     https://docs.openvidu.io/en/%s/openvidu-pro/deployment/on-premises/#deployment-instructions' "${OPENVIDU_VERSION//v}"
      printf '\n'
      printf '\n'
      exit 0
@@ -132,13 +132,13 @@ new_ov_installation() {
 
 get_previous_env_variable() {
      local ENV_VARIABLE_NAME=$1
-     echo $(grep -E "${ENV_VARIABLE_NAME}=.*$" "${OPENVIDU_PREVIOUS_FOLDER}/.env" | cut -d'=' -f2)
+     echo "$(grep -E "${ENV_VARIABLE_NAME}=.*$" "${OPENVIDU_PREVIOUS_FOLDER}/.env" | cut -d'=' -f2)"
 }
 
 replace_variable_in_new_env_file() {
      local ENV_VARIABLE_NAME=$1
      local ENV_VARIABLE_VALUE=$2
-     [[ ! -z "${ENV_VARIABLE_VALUE}" ]] && sed -i "s|#${ENV_VARIABLE_NAME}=|${ENV_VARIABLE_NAME}=${ENV_VARIABLE_VALUE}|" "${OPENVIDU_PREVIOUS_FOLDER}/.env-${OPENVIDU_VERSION}"
+     [[ -n "${ENV_VARIABLE_VALUE}" ]] && sed -i "s|#${ENV_VARIABLE_NAME}=|${ENV_VARIABLE_NAME}=${ENV_VARIABLE_VALUE}|" "${OPENVIDU_PREVIOUS_FOLDER}/.env-${OPENVIDU_VERSION}"
 }
 
 upgrade_ov() {
@@ -242,7 +242,7 @@ upgrade_ov() {
      printf '\n'
      cd "${TMP_FOLDER}" || fatal_error "Error when moving to 'tmp' folder"
      printf '\n'
-     docker-compose pull | true
+     docker-compose pull || true
 
      printf '\n     => Stopping Openvidu...'
      printf '\n'
@@ -252,7 +252,7 @@ upgrade_ov() {
      printf '\n'
      cd "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error when moving to 'openvidu' folder"
      printf '\n'
-     docker-compose down | true
+     docker-compose down || true
 
      printf '\n'
      printf '\n     => Moving to working dir...'
@@ -264,7 +264,7 @@ upgrade_ov() {
      mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml" "${ROLL_BACK_FOLDER}" || fatal_error "Error while moving previous 'docker-compose.yml'"
      printf '\n          - docker-compose.yml'
 
-     if [ ! -z "${USE_OV_CALL}" ]; then
+     if [ -n "${USE_OV_CALL}" ]; then
           mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.override.yml" "${ROLL_BACK_FOLDER}" || fatal_error "Error while moving previous 'docker-compose.override.yml'"
           printf '\n          - docker-compose.override.yml'
      fi
@@ -292,7 +292,7 @@ upgrade_ov() {
      mv "${TMP_FOLDER}/docker-compose.yml" "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error while updating 'docker-compose.yml'"
      printf '\n          - docker-compose.yml'
 
-     if [ ! -z "${USE_OV_CALL}" ]; then
+     if [ -n "${USE_OV_CALL}" ]; then
           mv "${TMP_FOLDER}/docker-compose.override.yml" "${OPENVIDU_PREVIOUS_FOLDER}" || fatal_error "Error while updating 'docker-compose.override.yml'"
           printf '\n          - docker-compose.override.yml'
      else
@@ -345,16 +345,16 @@ upgrade_ov() {
 
      # Define old mode: On Premise or Cloud Formation
      OLD_MODE=$(grep -E "Installation Mode:.*$" "${ROLL_BACK_FOLDER}/docker-compose.yml" | awk '{ print $4,$5 }')
-     [ ! -z "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml"
+     [ -n "${OLD_MODE}" ] && sed -i -r "s/Installation Mode:.+/Installation Mode: ${OLD_MODE}/" "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml"
 
      # Update .env variables to new .env-version
      AWS_REGION=$(get_previous_env_variable AWS_DEFAULT_REGION)
-     if [[ ! -z ${AWS_REGION} ]]; then
+     if [[ -n ${AWS_REGION} ]]; then
 
           # Get new AMI ID
           NEW_AMI_ID=$(curl https://s3-eu-west-1.amazonaws.com/aws.openvidu.io/CF-OpenVidu-Pro-${OPENVIDU_VERSION//v}.yaml --silent |
                          sed -n -e '/KMSAMIMAP:/,/Metadata:/ p' |
-                         grep -A 1 ${AWS_REGION} | grep AMI | tr -d " " | cut -d":" -f2)
+                         grep -A 1 "${AWS_REGION}" | grep AMI | tr -d " " | cut -d":" -f2)
           [[ -z ${NEW_AMI_ID} ]] && fatal_error "Error while getting new AWS_IMAGE_ID for Media Nodes"
 
           # Get previous values
@@ -430,7 +430,7 @@ else
 fi
 
 # Check type of installation
-if [[ ! -z "$1" && "$1" == "upgrade" ]]; then
+if [[ -n "$1" && "$1" == "upgrade" ]]; then
      upgrade_ov
 else
      new_ov_installation
diff --git a/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/openvidu b/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/openvidu
index b5a1462e..0551d4d7 100755
--- a/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/openvidu
+++ b/openvidu-server/deployments/pro/docker-compose/openvidu-server-pro/openvidu
@@ -28,7 +28,7 @@ collect_basic_information() {
   OV_VERSION=$(grep 'Openvidu Version:' "${OV_FOLDER}/docker-compose.yml" | awk '{ print $4 }')
   CONTAINERS=$(docker ps | awk '{if(NR>1) print $NF}')
 
-  if [ ! -z "$(grep -E '^        image: openvidu/openvidu-call:.*$' "${OV_FOLDER}/docker-compose.override.yml" | tr -d '[:space:]')" ]; then
+  if [ -n "$(grep -E '^        image: openvidu/openvidu-call:.*$' "${OV_FOLDER}/docker-compose.override.yml" | tr -d '[:space:]')" ]; then
     OV_CALL_VERSION=$(grep -E 'Openvidu-Call Version:' "${OV_FOLDER}/docker-compose.override.yml" | awk '{ print $4 }')
   fi
   [ -z "${OV_CALL_VERSION}" ] && OV_CALL_VERSION="No present"
@@ -150,10 +150,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ---------------------------------------"
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker logs $CONTAINER
+      docker logs "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'
@@ -167,10 +167,10 @@ generate_report() {
     do
       printf '\n'
       printf "\n  ======================================="
-      printf "\n  %s" $CONTAINER
+      printf "\n  %s" "$CONTAINER"
       printf "\n  ---------------------------------------"
       printf '\n'
-      docker exec $CONTAINER env
+      docker exec "$CONTAINER" env
       printf "\n  ---------------------------------------"
       printf '\n'
       printf '\n'