fix #1646

core/src/main/java/com/taobao/arthas/core/command/model/Base64Model.java

+package com.taobao.arthas.core.command.model;
+
+/**
+ * 
+ * @author hengyunabc 2021-01-05
+ *
+ */
+public class Base64Model extends ResultModel {
+
+    private String content;
+
+    public Base64Model() {
+    }
+
+    public Base64Model(String content) {
+        this.content = content;
+    }
+
+    @Override
+    public String getType() {
+        return "base64";
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/view/Base64View.java

+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.Base64Model;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * 
+ * @author hengyunabc 2021-01-05
+ *
+ */
+public class Base64View extends ResultView<Base64Model> {
+
+    @Override
+    public void draw(CommandProcess process, Base64Model result) {
+        String content = result.getContent();
+        if (content != null) {
+            process.write(content);
+        }
+        process.write("\n");
+    }
+
+}

site/src/site/sphinx/base64.md

+base64
+===
+
+
+> base64编码转换，和linux里的 base64 命令类似。
+
+
+### 对文件进行 base64 编码
+
+```bash
+[arthas@70070]$ echo 'abc' > /tmp/test.txt
+[arthas@70070]$ cat /tmp/test.txt
+abc
+
+[arthas@70070]$ base64 /tmp/test.txt
+YWJjCg==
+```
+
+### 对文件进行 base64 编码并把结果保存到文件里
+
+```bash
+$ base64 --input /tmp/test.txt --output /tmp/result.txt
+```
+
+### 用 base64 解码文件
+
+```
+$ base64 -d /tmp/result.txt
+abc
+```
+
+### 用 base64 解码文件并保存结果到文件里
+
+```bash
+$ base64 -d /tmp/result.txt --output /tmp/bbb.txt
+```

site/src/site/sphinx/en/base64.md

+base64
+===
+
+
+> Encode and decode using Base64 representation.
+
+
+### Encode to base64
+
+```bash
+[arthas@70070]$ echo 'abc' > /tmp/test.txt
+[arthas@70070]$ cat /tmp/test.txt
+abc
+
+[arthas@70070]$ base64 /tmp/test.txt
+YWJjCg==
+```
+
+### Encode to base64 and save output to file
+
+```bash
+$ base64 --input /tmp/test.txt --output /tmp/result.txt
+```
+
+### Decode from base64
+
+```
+$ base64 -d /tmp/result.txt
+abc
+```
+
+### Decode from base64 and save output to file
+
+```bash
+$ base64 -d /tmp/result.txt --output /tmp/bbb.txt
+```