Small content update

notes/Java 基础.md

@@ -1400,7 +1400,7 @@ public class Box<T> {
 }
 ```
 
-- [Java 泛型详解](http://www.importnew.com/24029.html)
+- [Java 泛型详解](https://www.cnblogs.com/Blue-Keroro/p/8875898.html)
 - [10 道 Java 泛型面试题](https://cloud.tencent.com/developer/article/1033693)
 
 ## 十、注解

notes/Java 并发.md

@@ -613,6 +613,7 @@ public static void main(String[] args) {
     WaitNotifyExample example = new WaitNotifyExample();
     executorService.execute(() -> example.after());
     executorService.execute(() -> example.before());
+    executorService.shutdown();
 }
 ```
 

notes/Linux.md

@@ -1077,6 +1077,11 @@ dmtsai tty1 Fri May 29 11:55 - 12:11 (00:15)
 
 ```html
 $ last -n 5 | awk '{print $1 "\t" $3}'
+dmtsai   192.168.1.100
+dmtsai   192.168.1.100
+dmtsai   192.168.1.100
+dmtsai   192.168.1.100
+dmtsai   Fri
 ```
 
 可以根据字段的某些条件进行匹配，例如匹配字段小于某个值的那一行数据。