diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index aa01707..753a0a6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -609,6 +609,102 @@ jobs:
       - name: check stdout
         run: |
           echo "stdout: ${{ steps.stdout.outputs.stdout }}"
+          if [ -z "${{ steps.stdout.outputs.stdout }}" ]; then
+            echo "Error: stdout is empty"
+            exit 1
+          fi
+
+      - id: stdout-multiline
+        name: capture multiline output
+        uses: ./
+        with:
+          host: ${{ env.REMOTE_HOST }}
+          username: linuxserver.io
+          password: password
+          port: 2222
+          capture_stdout: true
+          script: |
+            #!/usr/bin/env bash
+            set -e
+            echo "Line 1"
+            echo "Line 2"
+            echo "Line 3"
+            whoami
+            pwd
+
+      - name: check multiline output
+        run: |
+          echo "stdout: ${{ steps.stdout-multiline.outputs.stdout }}"
+          # Check if all lines are present
+          if ! echo "${{ steps.stdout-multiline.outputs.stdout }}" | grep -q "Line 1"; then
+            echo "Error: 'Line 1' not found in output"
+            exit 1
+          fi
+          if ! echo "${{ steps.stdout-multiline.outputs.stdout }}" | grep -q "Line 2"; then
+            echo "Error: 'Line 2' not found in output"
+            exit 1
+          fi
+          if ! echo "${{ steps.stdout-multiline.outputs.stdout }}" | grep -q "Line 3"; then
+            echo "Error: 'Line 3' not found in output"
+            exit 1
+          fi
+          if ! echo "${{ steps.stdout-multiline.outputs.stdout }}" | grep -q "linuxserver.io"; then
+            echo "Error: username not found in output"
+            exit 1
+          fi
+
+          # Check for duplicates - each unique line should appear exactly once
+          OUTPUT="${{ steps.stdout-multiline.outputs.stdout }}"
+          LINE1_COUNT=$(echo "$OUTPUT" | grep -c "^Line 1$" || true)
+          LINE2_COUNT=$(echo "$OUTPUT" | grep -c "^Line 2$" || true)
+          LINE3_COUNT=$(echo "$OUTPUT" | grep -c "^Line 3$" || true)
+
+          echo "Line 1 count: $LINE1_COUNT"
+          echo "Line 2 count: $LINE2_COUNT"
+          echo "Line 3 count: $LINE3_COUNT"
+
+          if [ "$LINE1_COUNT" -ne 1 ]; then
+            echo "Error: 'Line 1' appears $LINE1_COUNT times (expected 1)"
+            exit 1
+          fi
+          if [ "$LINE2_COUNT" -ne 1 ]; then
+            echo "Error: 'Line 2' appears $LINE2_COUNT times (expected 1)"
+            exit 1
+          fi
+          if [ "$LINE3_COUNT" -ne 1 ]; then
+            echo "Error: 'Line 3' appears $LINE3_COUNT times (expected 1)"
+            exit 1
+          fi
+
+          echo "✓ No duplicate lines detected"
+
+      - id: stdout-with-special-chars
+        name: capture output with special characters
+        uses: ./
+        with:
+          host: ${{ env.REMOTE_HOST }}
+          username: linuxserver.io
+          password: password
+          port: 2222
+          capture_stdout: true
+          script: |
+            #!/usr/bin/env bash
+            set -e
+            echo "Test with special chars: @#$%^&*()"
+            echo "Path: /home/user/test"
+            echo "JSON: {\"key\": \"value\"}"
+
+      - name: check special characters output
+        run: |
+          echo "stdout: ${{ steps.stdout-with-special-chars.outputs.stdout }}"
+          if ! echo "${{ steps.stdout-with-special-chars.outputs.stdout }}" | grep -q "special chars"; then
+            echo "Error: special characters test failed"
+            exit 1
+          fi
+          if ! echo "${{ steps.stdout-with-special-chars.outputs.stdout }}" | grep -q "/home/user/test"; then
+            echo "Error: path not found in output"
+            exit 1
+          fi
 
   testing-script-stop:
     runs-on: ubuntu-latest
diff --git a/entrypoint.sh b/entrypoint.sh
index d5d56b6..123c26d 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -71,11 +71,9 @@ if ! "${TARGET}" --version; then
 fi
 echo "======================================="
 if [[ "${INPUT_CAPTURE_STDOUT}" == 'true' ]]; then
-  {
-    echo 'stdout<<EOF'
-    "${TARGET}" "$@" | tee -a "${GITHUB_OUTPUT}"
-    echo 'EOF'
-  } >>"${GITHUB_OUTPUT}"
+  echo 'stdout<<EOF' >> "${GITHUB_OUTPUT}"
+  "${TARGET}" "$@" | tee -a "${GITHUB_OUTPUT}"
+  echo 'EOF' >> "${GITHUB_OUTPUT}"
 else
   "${TARGET}" "$@"
 fi