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egrep
===
在文件内查找指定的字符串
## 说明
**egrep命令** 用于在文件内查找指定的字符串。egrep执行效果与`grep -E`相似， ， ， ，
## 选项
```
， ，
```
## 实例
显示文件中符合条件的字符。例如，查找当前目录下所有文件中包含字符串"Linux"的文件，可以使用如下命令：
```
```
结果如下所示：
```
testfile:hello Linux!
testfile:Linux is a free Unix-type operating system.
testfile:This is a Linux testfile!
testfile:Linux
testfile:Linux
#以下两行为testfile1中含Linux字符的行
testfile1:helLinux!
testfile1:This a Linux testfile!
#以下两行为 testfile_2 中包含Linux字符的行
testfile_2:Linux is a free unix-type opterating system
testfile_2:Linux test
```
