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egrep
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===
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在文件内查找指定的字符串
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## 说明
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**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，使用的语法及参数可参照grep指令，与grep的不同点在于解读字符串的方法。egrep是用extended regular expression语法来解读的，而grep则用basic regular expression 语法解读，extended regular expression比basic regular expression的表达更规范
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## 选项
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```
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egrep(选项)(查找模式)(文件名1，文件名2，……)
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```
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## 实例
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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：
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```
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egrep Linux *
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```
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结果如下所示：
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```
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#以下五行为 testfile 中包含Linux字符的行
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testfile:hello Linux!
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testfile:Linux is a free Unix-type operating system.
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testfile:This is a Linux testfile!
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testfile:Linux
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testfile:Linux
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#以下两行为testfile1中含Linux字符的行
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testfile1:helLinux!
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testfile1:This a Linux testfile!
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#以下两行为 testfile_2 中包含Linux字符的行
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testfile_2:Linux is a free unix-type opterating system
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testfile_2:Linux test
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```
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