diff --git a/sys/sys.go b/sys/sys.go
index 3f20fe0..e76b876 100644
--- a/sys/sys.go
+++ b/sys/sys.go
@@ -59,13 +59,17 @@ func ManageStatusCmd(cmd *exec.Cmd, err error) int {
 	return -1
 }
 
-func RunInteractiveCmd(cmd string, withStderr bool) int {
+func RunInteractiveCmd(cmd string, withStderr bool, buffers ...io.Writer) int {
 	// fmt.Printf(" == go before command : %s\n", cmd)
 	icmd := exec.Command("bash", "-c", cmd)
 	icmd.Stdin = os.Stdin
 	icmd.Stdout = os.Stdout
 	if withStderr {
-		icmd.Stderr = os.Stderr
+		if len(buffers) > 0 {
+			icmd.Stderr = buffers[0]
+		} else {
+			icmd.Stderr = os.Stderr
+		}
 	}
 	return ManageStatusCmd(icmd, icmd.Run())
 }