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look
===
显示文件中以指定字符串开头的任意行
## 补充说明
**look命令** 用于显示文件中以指定字符串开头的任意行。
### 语法
```
look(选项)(参数)
```
### 选项
```
-a使用另一个字典文件web2该文件也位于/usr/dict目录下
-d只对比英文字母和数字其余一概忽略不予比对
-f忽略字符大小写差别
-t<字尾字符串>:设置字尾字符串。
```
### 参数
* 字符串:指定要查找的字符串;
* 文件:指定要查找的目标文件。
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