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                            ### 1. 標準輸入輸出


### 2. 輸出重定向
> 把命令的結果保存到文件中，不輸出到屏幕上了。

![](https://img.kancloud.cn/0b/65/0b65197d742faa4c6d867d78130cddbc_861x328.png)
> 注意截圖中的空格，錯誤命令2>>文件兩側沒有空格。

![](https://img.kancloud.cn/54/e8/54e8753afebc58b706331a300c2542ae_877x370.png)


### 3.輸入重定向

> 沒什么卵用、









                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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