diff --git a/assets/out b/assets/out
index 5190e6f..0427716 100755
--- a/assets/out
+++ b/assets/out
@@ -12,60 +12,59 @@ payload=$(mktemp /tmp/resource.XXXXXX)
 cat > "${payload}" <&0
 
 # source
-bitbucket_type=`jq -r '.source.bitbucket_type // "server"' < ${payload}`
-base_url=`jq -r '.source.base_url // ""' < ${payload}`
-username=`jq -r '.source.username // ""' < ${payload}`
-password=`jq -r '.source.password // ""' < ${payload}`
-project=`jq -r '.source.project // ""' < ${payload}`
-repository=`jq -r '.source.repository // ""' < ${payload}`
-dir=`jq -r '.source.dir // ""' < ${payload}`
+bitbucket_type=$(jq -r '.source.bitbucket_type // "server"' < "${payload}")
+base_url=$(jq -r '.source.base_url // ""' < "${payload}")
+username=$(jq -r '.source.username // ""' < "${payload}")
+password=$(jq -r '.source.password // ""' < "${payload}")
+project=$(jq -r '.source.project // ""' < "${payload}")
+repository=$(jq -r '.source.repository // ""' < "${payload}")
+dir=$(jq -r '.source.dir // ""' < "${payload}")
 if [[ ! ${dir} ]]; then
     dir=$repository
 fi
 # params
-build=`jq '.params' < ${payload}`
+build=$(jq '.params' < "${payload}")
 
-if [[ ! ${base_url} ]]; then
+if [[ ! "${base_url}" ]]; then
     echo "error: source.base_url can't be empty"
     exit 1
 fi
 
-cd ${dir}
+cd "${dir}"
 
-pr=`cat pull-request-info`
-commit=`echo ${pr} | jq -r '.commit'`
+pr=$(cat pull-request-info)
+commit=$(echo "${pr}" | jq -r '.commit')
 build_url="${ATC_EXTERNAL_URL}/builds/${BUILD_ID}"
-if [[ "$bitbucket_type" == "server" ]]; then
+if [[ "${bitbucket_type}" == "server" ]]; then
     url="${base_url}/rest/build-status/1.0/commits/${commit}"
 
-    json=`echo "${build}" | jq --arg build_url "${build_url}" --arg id "${BUILD_ID}" '{
+    json=$(echo "${build}" | jq --arg build_url "${build_url}" --arg id "${BUILD_ID}" '{
         state: .state,
         key: .key,
         name: (.key + "-" + $id),
         url: $build_url,
         description: .description|tostring
-    }'`    
+    }')
 elif [[ "$bitbucket_type" == "cloud" ]]; then
     url="${base_url}/api/2.0/repositories/${project}/${repository}/commit/${commit}/statuses/build"
 
-
     # expand variables like $BUILD_ID before passing into JSON
     name=$(echo "$build"| jq -r '.name')
-    name=$(eval echo $name)
+    name=$(eval echo "$name")
     desc=$(echo "$build"| jq -r '.description')
-    desc=$(eval echo $desc)
+    desc=$(eval echo "$desc")
     build_url=$(echo "$build"| jq -r '.url')
-    build_url=$(eval echo $build_url)
-    json=`echo "${build}" | jq --arg build_url "${build_url}" --arg id "${BUILD_ID}" --arg name "$name" --arg desc "$desc" '{
+    build_url=$(eval echo "$build_url")
+    json=$(echo "${build}" | jq --arg build_url "${build_url}" --arg id "${BUILD_ID}" --arg name "${name}" --arg desc "${desc}" '{
         state: .state,
         key: $name,
         name: ($name + "-" + $id),
         url: $build_url,
         description: $desc
-    }'` 
+    }')
 fi
 
-curl -s --fail -u ${username}:${password} -H "Content-Type: application/json" -XPOST ${url} -d "${json}"
+curl -s --fail -u "${username}:${password}" -H "Content-Type: application/json" -XPOST "${url}" -d "${json}"
 
 jq -n --argjson pr "${pr}" --argjson pr "${pr}" '{
     version: {