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                            Linux shell 可以用戶定義函數，然后在shell腳本中可以隨便調用，shell中函數的定義格式如下：

```
函數名()
{
    action;

    [return int;]
}
```

函數可以帶返回值，寫法是return int; 取值范圍是0~255，注意只能返回整數；也可以不用返回值。調用的方式是在腳本中直接填寫函數名即可，比如先前我們用到的日志輸出接口LOGD和LOGE。

### 

比如我們實現一個函數完成從1到10 的累加；需要補充說明的是：返回值會被存儲在一個 **$?** 中：
![](https://img.kancloud.cn/4b/07/4b07d788916e6e021d6d08aefaaf6553_644x470.png =600x)

程序運行結果：
![](https://img.kancloud.cn/bc/a8/bca81d80e213baa33f664bbd05cd6b0e_832x108.png =700x)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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