diff --git a/_demo/commandrun/commandrun.go b/_demo/commandrun/commandrun.go
new file mode 100644
index 00000000..df05e9e4
--- /dev/null
+++ b/_demo/commandrun/commandrun.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"bytes"
+	"os/exec"
+)
+
+func main() {
+	var data bytes.Buffer
+	cmd := exec.Command("echo", "hello llgo")
+	cmd.Stdout = &data
+	err := cmd.Run()
+	if err != nil {
+		panic(err)
+	}
+	println("len:", len(data.Bytes()))
+	println("data:", data.String())
+}