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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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