V2EX egrep

Egrep

释义 Definition

egrep 是类 Unix 系统中的命令行工具,用于在文本中按扩展正则表达式(Extended Regular Expressions, ERE)进行搜索并输出匹配行。许多现代系统中,egrep 已被视为 grep -E 的等价写法(有的系统会提示已不推荐单独使用 egrep)。

发音 Pronunciation

/irp/

例句 Examples

I used egrep to find all lines containing an email address.
我用 egrep 查找所有包含电子邮箱地址的行。

Using egrep with a carefully designed pattern, the analyst scanned multiple log files to identify repeated authentication failures across different servers.
分析人员用精心设计的 egrep 模式扫描多个日志文件,识别不同服务器上反复出现的认证失败。

词源 Etymology

egrep 来自 grep(意为“搜索文本并打印匹配内容”)加上 e-(表示 extended,即“扩展的”)。它强调使用扩展正则(如 + ? | () 等在 ERE 中更常用的写法)。在很多实现里,egrep 只是 grep -E 的别名或同功能入口。

相关词 Related Words

文学与著作中的用例 Literary Works

  • UNIX Power Tools(Unix 工具书中常用 egrep 讲解文本检索与正则用法)
  • The UNIX Programming Environment(讨论 Unix 文本处理工具链时会涉及 grep/egrep 的使用场景)
  • Learning the bash Shell(在 shell 脚本与管道示例中常出现 egrep/grep -E 的用法)
  • Linux Command Line and Shell Scripting Bible(讲解日志分析、模式匹配时常提及 egrep 及其等价形式)
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