diff --git a/distribute/prebuild.sh b/distribute/prebuild.sh
index 41d0b41..aa210d4 100644
--- a/distribute/prebuild.sh
+++ b/distribute/prebuild.sh
@@ -1,9 +1,10 @@
 # This is pre-build script that cleans up resources and compiles for selected pages, then finally you may combine those subdirectories into one via nginx.
+# double check you are using LF instead of CRLF
 
 export KEEP_PAGES="Math3200"
 
 # check if environment variable is set
-if $KEEP_PAGES == ""; then
+if [ -z "$KEEP_PAGES" ]; then
     echo "Please set environment variable KEEP_PAGES to the pages you want to keep for microsite building."
     exit 1
 fi
@@ -13,26 +14,44 @@ echo "Currently compiling pages: ${KEEP_PAGES}"
 # Rewrite base _meta.js and next.config.js for export pages
 echo "Rewrite base _meta.js and keeping ${KEEP_PAGES}"
 
-cp ./${KEEP_PAGES}/_meta.js ../content/_meta.js
+cp "./distribute/${KEEP_PAGES}/_meta.js" "./content/_meta.js"
 
 # remove other subdirectories
-for dir in ../content/; do
-    if [ "$dir" != "${KEEP_PAGES}/" ]; then
-        rm -rf $dir
-    fi
+for dir in ./content/*/; do
+    # strip the leading path and trailing slash
+    base_dir="$(basename "${dir%/}")"
+
+    # check if base_dir is in KEEP_PAGES (space-separated list)
+    case " $KEEP_PAGES " in
+        *" $base_dir "*) 
+            echo "Keeping content dir: $dir"
+            ;;
+        *)
+            echo "Removing content dir: $dir"
+            rm -rf -- "$dir"
+            ;;
+    esac
 done
 
 # remove public directory
-for dir in ../public/; do
-    if [ "$dir" != "${KEEP_PAGES}/" ]; then
-        rm -rf $dir
-    fi
+for dir in ./public/*/; do
+    base_dir="$(basename "${dir%/}")"
+
+    case " $KEEP_PAGES " in
+        *" $base_dir "*) 
+            echo "Keeping public dir: $dir"
+            ;;
+        *)
+            echo "Removing public dir: $dir"
+            rm -rf -- "$dir"
+            ;;
+    esac
 done
 
 echo "Done clearing up resources and compiling for ${KEEP_PAGES}"
 
 echo "modify next.config.js"
 
-cp ./next.config.js ../next.config.js
+cp "./distribute/next.config.js" "./next.config.js"
 
 
diff --git a/package.json b/package.json
index 40b799b..2f1b670 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "scripts": {
     "dev": "next --turbopack",
-    "build": "cross-env VERCEL_FORCE_NO_BUILD_CACHE=1 NODE_OPTIONS='--max-old-space-size=16384' next build",
+    "build": "bash ./distribute/prebuild.sh && cross-env VERCEL_FORCE_NO_BUILD_CACHE=1 NODE_OPTIONS='--max-old-space-size=16384' next build",
     "build:test": "cross-env ANALYZE=true NODE_OPTIONS='--inspect --max-old-space-size=4096' next build",
     "build:analyze": "cross-env ANALYZE=true NODE_OPTIONS='--max-old-space-size=16384' next build",
     "postbuild": "next-sitemap && pagefind --site .next/server/app --output-path out/_pagefind",