diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 30a4bc1..c0ed349 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -26,11 +26,5 @@ jobs:
       - uses: actions/checkout@v2
 
       # Runs a single command using the runners shell
-      - name: Run a one-line script
-        run: echo Hello, world!
-
-      # Runs a set of commands using the runners shell
-      - name: Run a multi-line script
-        run: |
-          echo Add other actions to build,
-          echo test, and deploy your project.
+      - name: shell check
+        run: docker-compose run --rm shellcheck ./validate.sh
diff --git a/docker-compose.yaml b/docker-compose.yaml
new file mode 100644
index 0000000..4349a5a
--- /dev/null
+++ b/docker-compose.yaml
@@ -0,0 +1,8 @@
+---
+version: '3.9'
+services:
+  shellcheck:
+    image: koalaman/shellcheck-alpine:latest
+    volumes:
+      - ".:/build"
+    working_dir: /build
diff --git a/validate.sh b/validate.sh
new file mode 100755
index 0000000..c732d71
--- /dev/null
+++ b/validate.sh
@@ -0,0 +1,11 @@
+#!/bin/sh -l
+
+set -euo pipefile
+
+rc=0
+for filename in $(find ./* -name '*.sh'); do
+  echo "Validating"
+  shellcheck "${filename}" || exit $?
+done
+
+exit $?
\ No newline at end of file