Linux下粉碎文件

```bash
shred -n 5 -z -u filename.txt
```
[-n](# "重写次数, 默认为3."),
[-z](# "重写的最后进行0 zeros填充, 隐藏粉碎的痕迹."),
[-u (--remove)](# "完成后对文件进行截断和删除."),

https://www.cyberciti.biz/tips/linux-how-to-delete-file-securely.html

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