# nice

改变程序执行的优先权等级

## 补充说明

**nice命令** 用于以指定的进程调度优先级启动其他的程序。

### 语法

```
nice(选项)(参数)
```

### 选项

```
-n：指定进程的优先级（整数）。
```

### 参数

指令及选项：需要运行的指令及其他选项。

### 实例

新建一个进程并设置优先级，将当前目录下的documents目录打包，但不希望tar占用太多CPU：

```
nice -19 tar zcf pack.tar.gz documents
```

方法非常简单，即在原命令前加上`nice -19`。很多人可能有疑问了，最低优先级不是19么？那是因为这个“-19”中的“-”仅表示参数前缀；所以，如果希望将当前目录下的documents目录打包，并且赋予tar进程最高的优先级：

```
nice --19 tar zcf pack.tar.gz documents
```


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