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doc: Update nohup.md (#621)

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@ -47,4 +47,16 @@ nohup wget site.com/file.zip
nohup ping -c 10 baidu.com
```
### 最简单的后台运行
nohup command &
### 输出默认重定向到当前目录下 nohup.out 文件
nohup python main.py &
### 自定义输出文件(标准输出和错误输出合并到 main.log)
nohup python main.py >> main.log 2>&1 &
### 与上一个例子相同作用的简写方法
nohup python main.py &> main.log &
### 不记录输出信息
nohup python main.py &> /dev/null &
### 不记录输出信息并将程序的进程号写入 pidfile.txt 文件中，方便后续杀死进程
nohup python main.py &> /dev/null & echo $! > pidfile.txt