diff --git a/.github/workflows/latex-three-os.yml b/.github/workflows/latex-three-os.yml
index 0776e38..f9fcd77 100644
--- a/.github/workflows/latex-three-os.yml
+++ b/.github/workflows/latex-three-os.yml
@@ -11,7 +11,6 @@ defaults:
 
 jobs:
   run-on-three-os:
-    if: false
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
@@ -40,7 +39,7 @@ jobs:
           fi
           echo "os_null=$OS_NULL" >> $GITHUB_ENV
 
-          # env.unique_id
+          # env.artifact_id
           OS_SHORT=${{ matrix.os }}
           OS_SHORT=${OS_SHORT/-latest/}
           SHA1_SHORT=$(git rev-parse --short HEAD)
@@ -49,27 +48,18 @@ jobs:
           else
             ID="$OS_SHORT-$SHA1_SHORT-${{ github.run_attempt }}"
           fi
-          echo "unique_id=$ID" >> $GITHUB_ENV
+          echo "artifact_id=$ID" >> $GITHUB_ENV
 
-      # - name: Run example(s)
-      #   working-directory: latex-examples
-      #   run: |
-      #     # ENGINES=("pdflatex" "lualatex")
-      #     ENGINES=("pdflatex")
-      #     for engine in ${ENGINES[@]}; do
-      #       $engine l3benchmark-gh1182*.tex # > "${{ env.os_null }}"
-      #       # use "%0A" to throw a multiline warning
-      #       # https://github.com/actions/toolkit/issues/193#issuecomment-605394935
-      #       log_filtered=$(\
-      #         grep -rh "seconds\|\[debug\] " *.log | \
-      #         awk 'BEGIN {RS=""}{gsub(/\n/,"%0A",$0); print $0}' \
-      #       )
-      #       # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-a-warning-message
-      #       echo "::warning file=l3benchmark-gh1182-$engine*.log,line=1,col=1,endColumn=2::$log_filtered"
-      #     done
+      - name: Test lua `io.write()`
+        shell: bash
+        working-directory: lua
+        run: |
+          texlua eol.lua
+          for file in `ls *.txt`; do echo $file; xxd $file; done
 
-      # - name: Archive
-      #   uses: actions/upload-artifact@v3
-      #   with:
-      #     name: latex-examples-${{ env.unique_id }}
-      #     path: latex-examples
+      - name: Archive
+        uses: actions/upload-artifact@v3
+        with:
+          name: lua-eol-${{ env.artifact_id }}
+          path: |
+            lua/*.txt
diff --git a/lua/eol.lua b/lua/eol.lua
new file mode 100644
index 0000000..f232c0f
--- /dev/null
+++ b/lua/eol.lua
@@ -0,0 +1,12 @@
+local function test_eol(fname, content)
+  -- open file in binary mode, to avoid convertion from \n to \r\n in Win
+  -- http://lua-users.org/lists/lua-l/2015-05/msg00349.html
+  local file = io.open(fname, "wb")
+  io.output(file)
+  io.write(content)
+  io.close(file)
+end
+
+test_eol("eol-crlf.txt", "abc\r\nabc\r\n")
+test_eol("eol-lf.txt", "abc\nabc\n")
+test_eol("eol-mixed.txt", "abc\r\nabc\n")