diff --git a/cmd/internal/run/run.go b/cmd/internal/run/run.go
index 5e37ac5..7365b19 100644
--- a/cmd/internal/run/run.go
+++ b/cmd/internal/run/run.go
@@ -79,12 +79,15 @@ func run() cli.ActionFunc {
 		}
 		defer d.Close()
 
+		// fetches <path> for `ww run <path>`
+		bootloader := unixFSNode{
+			Name: c.Args().First(),
+			Unix: ipfs.Unixfs()}
+
 		return ww.Env{
 			IPFS: ipfs,
 			Host: h,
-			Boot: unixFSNode{
-				Name: c.Args().Get(1),
-				Unix: ipfs.Unixfs()},
+			Boot: bootloader,
 			WASM: wazero.NewRuntimeConfig().
 				WithDebugInfoEnabled(c.Bool("debug")).
 				WithCloseOnContextDone(true),
diff --git a/examples/hello-world/main.go b/examples/echo/main.go
similarity index 75%
rename from examples/hello-world/main.go
rename to examples/echo/main.go
index 980bee5..ac12d3f 100644
--- a/examples/hello-world/main.go
+++ b/examples/echo/main.go
@@ -3,9 +3,10 @@
 package main
 
 import (
+	"io"
 	"os"
 )
 
 func main() {
-	os.Exit(0)
+	io.Copy(os.Stdout, os.Stdin)
 }
diff --git a/examples/echo/main.wasm b/examples/echo/main.wasm
new file mode 100755
index 0000000..0ac007d
Binary files /dev/null and b/examples/echo/main.wasm differ
diff --git a/examples/hello-world/main.wasm b/examples/hello-world/main.wasm
deleted file mode 100755
index 13f4c72..0000000
Binary files a/examples/hello-world/main.wasm and /dev/null differ
diff --git a/testdata/main.go b/testdata/main.go
deleted file mode 100644
index 3097d65..0000000
--- a/testdata/main.go
+++ /dev/null
@@ -1,20 +0,0 @@
-//go:generate env GOOS=wasip1 GOARCH=wasm go build -o main.wasm
-
-package main
-
-import (
-	"fmt"
-	"io"
-	"os"
-)
-
-func main() {
-	n, err := io.Copy(os.Stdout, os.Stdin)
-	fmt.Fprintf(os.Stderr, "copied %d bytes", n)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	} else {
-		os.Exit(0)
-	}
-}
diff --git a/testdata/main.wasm b/testdata/main.wasm
deleted file mode 100755
index 92eb4b9..0000000
Binary files a/testdata/main.wasm and /dev/null differ
diff --git a/ww_test.go b/ww_test.go
index dd87df1..dabc498 100644
--- a/ww_test.go
+++ b/ww_test.go
@@ -14,7 +14,7 @@ import (
 	ww "github.com/wetware/go"
 )
 
-//go:embed testdata/main.wasm
+//go:embed examples/echo/main.wasm
 var fileContent []byte
 
 func TestEcho(t *testing.T) {
@@ -42,12 +42,12 @@ func TestEcho(t *testing.T) {
 			// WithDebugInfoEnabled(true).
 			WithCloseOnContextDone(true),
 		Module: wazero.NewModuleConfig().
-			WithArgs("/testdata/main.wasm").
+			WithArgs("/examples/echo/main.wasm").
 			WithStdin(stdin).
 			WithStdout(stdout).
 			WithStderr(stderr).
 			WithFSConfig(wazero.NewFSConfig().
-				WithDirMount("testdata", "/testdata/")),
+				WithDirMount("examples/echo", "/examples/echo/")),
 	}.Serve(ctx)
 
 	require.NoError(t, err, "server failed")