diff --git a/lib/xy.h b/lib/xy.h
index bb7df84..76831e2 100644
--- a/lib/xy.h
+++ b/lib/xy.h
@@ -8,7 +8,7 @@
  * Contributors  :   juzeon   <skyjuzheng@gmail.com>
  *               |
  * Created On    : <2023-08-28>
- * Last Modified : <2024-12-14>
+ * Last Modified : <2025-06-20>
  *
  * xy: 襄阳、咸阳
  * Corss-Platform C utilities for CLI applications in Ruby flavor
@@ -17,8 +17,10 @@
 #ifndef XY_H
 #define XY_H
 
-#define _XY_Version      "v0.1.4.4-2024/12/14"
-#define _XY_Maintain_URL "https://gitee.com/RubyMetric/chsrc/blob/main/include/xy.h"
+#define _XY_Version       "v0.1.5.0-2025/06/20"
+#define _XY_Maintain_URL  "https://github.com/RubyMetric/chsrc/blob/main/lib/xy.h"
+#define _XY_Maintain_URL2 "https://gitee.com/RubyMetric/chsrc/blob/main/lib/xy.h"
+
 
 #include <assert.h>
 #include <stdarg.h>
@@ -646,6 +648,41 @@ xy_run (const char *cmd, unsigned long n)
 }
 
 
+
+
+/******************************************************
+ *                      cross OS
+ ******************************************************/
+
+ /**
+ * 该函数同 just 中的 os_family()，只区分 windows, unix
+ *
+ * @return 返回 "windows" 或 "unix"
+ */
+#define xy_os_family _xy_os_family ()
+static char *
+_xy_os_family ()
+{
+  if (xy_on_windows)
+    return "windows";
+  else
+    return "unix";
+}
+
+
+/**
+ * 该函数返回所在 os family 的对应字符串
+ */
+static const char *
+xy_os_depend_str (const char *str_for_win, const char *str_for_unix)
+{
+  if (xy_on_windows)
+    return str_for_win;
+  else
+    return str_for_unix;
+}
+
+
 #define xy_os_home _xy_os_home ()
 static char *
 _xy_os_home ()
diff --git a/test/xy.c b/test/xy.c
index 1edd52c..78c3828 100644
--- a/test/xy.c
+++ b/test/xy.c
@@ -6,7 +6,7 @@
  * Contributors  :  Nil Null  <nil@null.org>
  *               |
  * Created On    : <2023-08-30>
- * Last Modified : <2025-06-19>
+ * Last Modified : <2025-06-20>
  *
  * Test xy.h
  * ------------------------------------------------------------*/
@@ -17,6 +17,9 @@ int
 main (int argc, char const *argv[])
 {
   xy_useutf8 ();
+
+  puts (xy_os_depend_str ("Hello, Windows!", "Hello, Unix!"));
+
   puti (3);
   double dbl = 3.1415;
   putf (dbl);