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                            **2>&1**解釋：

將標準錯誤 2 重定向到標準輸出 &1 ，標準輸出 &1 再被重定向輸入到 runoob.log 文件中。

*   0 – stdin (standard input，標準輸入)
*   1 – stdout (standard output，標準輸出)
*   2 – stderr (standard error，標準錯誤輸出)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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