支持delete，修改err输出为stderr

cmd/saastool/params.go

@@ -62,7 +62,7 @@ func paramBatchSize(fs *flag.FlagSet) *uint {
 }
 
 func paramBlockSize(fs *flag.FlagSet) *string {
-	return fs.String("blocksize", "50M", "Block size to make hash. using size mode K, M, G, T")
+	return fs.String("blocksize", "200M", "Block size to make hash. using size mode K, M, G, T")
 }
 
 func paramClear(fs *flag.FlagSet) *bool {
@@ -106,17 +106,3 @@ func ParseByteSize(sizeStr string) (uint64, error) {
 		return 0, fmt.Errorf("unknown unit: %s", unit)
 	}
 }
-
-/*
-func main() {
-    sizes := []string{"1K", "2M", "3G", "4T", "5"}
-    for _, sizeStr := range sizes {
-        size, err := ParseByteSize(sizeStr)
-        if err != nil {
-            fmt.Printf("Error parsing %s: %v\n", sizeStr, err)
-        } else {
-            fmt.Printf("%s = %d bytes\n", sizeStr, size)
-        }
-    }
-}
-*/