adding exec_extra

exec_extra/func.go

@@ -0,0 +1,13 @@
+package exec_extra
+
+import (
+	`os/exec`
+)
+
+func ExecCmdReturn(cmd *exec.Cmd) (exitStatus int, err error) {
+	// https://stackoverflow.com/a/55055100/733214
+	err = cmd.Run()
+	exitErr, _ := err.(*exec.ExitError)
+	exitStatus = exitErr.ExitCode()
+	return
+}