シェル関連の参考資料

1.  https://blog.csdn.net/sunny05296/article/details/71173467

2. https://blog.csdn.net/wanxiaoderen/article/details/82388091

3. https://blog.csdn.net/wangcg123/article/details/50667883

4. https://blog.csdn.net/mzc11/article/details/79584901

5. https://blog.csdn.net/zl87758539/article/details/77481679