diff --git a/bw-dev b/bw-dev
index 0a06b5edb..97a38834b 100755
--- a/bw-dev
+++ b/bw-dev
@@ -131,7 +131,7 @@ case "$CMD" in
         makeitblack
         ;;
     populate_streams)
-        runweb python manage.py populate_streams $@
+        runweb python manage.py populate_streams "$@"
         ;;
     populate_suggestions)
         runweb python manage.py populate_suggestions
@@ -140,7 +140,7 @@ case "$CMD" in
         runweb python manage.py generateimages
         ;;
     generate_preview_images)
-        runweb python manage.py generate_preview_images $@
+        runweb python manage.py generate_preview_images "$@"
         ;;
     copy_media_to_s3)
         awscommand "bookwyrm_media_volume:/images"\
@@ -155,11 +155,18 @@ case "$CMD" in
             --acl public-read" "$@"
         ;;
     set_cors_to_s3)
+	set +x
+        config_file=$1
+        if [ -z "$config_file" ]; then
+            echo "This command requires a JSON file containing a CORS configuration as an argument"
+            exit 1
+        fi
+	set -x
         awscommand "$(pwd):/bw"\
             "s3api put-bucket-cors\
             --bucket ${AWS_STORAGE_BUCKET_NAME}\
             --endpoint-url ${AWS_S3_ENDPOINT_URL}\
-            --cors-configuration file:///bw/$@"
+            --cors-configuration file:///bw/$config_file" "$@"
         ;;
     runweb)
         runweb "$@"