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Date: Wed, 7 Oct 2026 21:08:07 +0800
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+# 实践题 M-P-01
+
+这道题是在 Linux 里创建用户 testuser 和组 testgroup，把用户加进组，再用 id 验证。
+
+脚本是 setup_user.sh，运行后 id testuser 的输出是：
+
+```
+uid=1001(testuser) gid=1002(testuser) groups=1002(testuser),1001(testgroup)
+```
+
+可以看到 groups 里有 testgroup，说明加入成功。