init commit.

main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	_startTime := time.Now()
+	defer func() {
+		fmt.Print("Time cost: ")
+		fmt.Println(time.Now().Sub(_startTime))
+	}()
+
+	p, fi := PathOrPWD()
+	if !fi.IsDir() {
+		fmt.Println(p)
+		fmt.Println("empty-dir: Arg must be dir path.")
+		return
+	}
+
+	emptyDir(p)
+}