fixed stream already open error

lib.go

@@ -396,8 +396,8 @@ func ExecStr(str string, opts ...*Opts) (string, error) {
 			return nil, err
 		}
 		cmd := exec.Command(str, l.Tokens[1:]...)
-		cmd.Stdout = log.Writer()
-		cmd.Stderr = log.Writer()
+		// cmd.Stdout = log.Writer()
+		// cmd.Stderr = log.Writer()
 		cmd.Dir = cmdwd
 		opt.SetupProc(cmd)
 		ret = append(ret, cmd)