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Linux 文本三剑客之 grep 实战手册(后端工程师版)

  • 2026-06-29 02:44:38
Linux 文本三剑客之 grep 实战手册(后端工程师版)

一、grep 核心定位

grep 是 Linux 文本三剑客(grepsedawk)中专注于文本搜索匹配的工具,核心特点:快、准、灵活

核心用途:解决「从文件/输入流中筛选包含指定模式内容」的需求,后端处理几百兆的def文件、几十G的日志文件时,效率远超手动打开查阅!

二、前置配置(~/.cshrc 预设,提升可读性)

 ~/.cshrc 中添加以下alias,让搜索结果自动高亮,查看更清晰,配置后执行 source ~/.cshrc生效。

csh# 普通文件搜索,结果高亮显示alias grep 'grep --color=auto'# 压缩文件(*.gz)检索,结果高亮显示alias zgrep 'zgrep --color=auto'

三、核心语法格式

cshgrep -[参数] "检索内容" 目标文件/目录

四、高频常用参数(后端实战必备)

1. 无参数(基础匹配)

核心含义:基础匹配,输出含关键词的整行

示例grep "Startpoint" reg2reg_path.rpt(搜索时序报告中的起点信息)

2. -e(多关键词匹配)

核心含义:同时匹配多个关键词

示例grep -e "Startpoint" -e "Endpoint" -e "Slack" reg2reg_path.rpt(一次性抓取时序关键信息)

3. -A/-B/-C(上下文匹配)

核心含义:输出匹配行的上下文;-A n:后n行(after);-B n:前n行(before);-C n:前后各n行(context,空格可有可无

示例grep -A2 "Startpoint" reg2reg_path.rpt(输出起点行及后2行,共3行)

4. -r(递归搜索)

核心含义:递归搜索目录下所有文件,该目录下有目录也会搜其下文件

示例grep -r "Startpoint" timingRpt/*(遍历时序报告目录所有文件)

5. -v(反向匹配)

核心含义:反向匹配,输出不含关键词的行

示例ps -ef | grep java | grep -v grep(过滤掉grep自身进程,只留innovus进程)

6. -i(忽略大小写)

核心含义:忽略大小写匹配

示例grep -i "error" app.log(匹配ERROR/Error/error等)

7. -c(统计行数)

核心含义:只统计匹配行数,不输出内容

示例grep -c "Slack" reg2reg_path.rpt(统计时序报告中Slack相关行数)

五、正则匹配技巧(精准筛选文本)

正则是grep的核心优势,以下是后端日常高频用法,精准匹配所需内容,避免无效信息干扰:

1. 行首/行尾匹配

匹配以hello开头的行:grep "^hello" file.rpt

匹配以hello结尾的行:grep "hello$" file.rpt

2. 完整单词匹配

只匹配单独的单词hello,不匹配hellohelloahello等:grep "\<hello\>" file.rpt

说明:\<锚定词首,\>锚定词尾,确保匹配完整单词。

3. 字符范围匹配(高频重点)

1[a-z]:匹配任意一个小写字母

示例grep "a[a-z]" file.rpt(匹配a后接小写字母的内容)

2[A-Z]:匹配任意一个大写字母

示例grep "ID_[A-Z]" file.rpt(匹配ID_后接大写字母的内容)

3[0-9]:匹配任意一个数字

示例grep "num_[0-9]" file.rpt(匹配num_后接数字的内容)

4[^]:反向匹配,排除括号内的字符

示例grep "a[^a-z]" file.rpt(匹配a后不接小写字母的内容,如a1a_等)

5.:匹配任意单个字符(换行符除外)

示例grep "f.n" file.rpt(匹配fanfinfon等)

6.*:匹配任意一段内容(最常用)

核心说明:涵盖空格、数字、符号等任意内容

示例grep "a.*p" file.rpt(匹配a开头、p结尾的任意内容,如asdfpthis is a apple等)

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  1. CONNECT:[ UseTime:0.000549s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000811s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000271s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000468s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000510s ]
  8. SELECT * FROM `article` WHERE `id` = 487474 LIMIT 1 [ RunTime:0.000654s ]
  9. UPDATE `article` SET `lasttime` = 1783058376 WHERE `id` = 487474 [ RunTime:0.023552s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000403s ]
  11. SELECT * FROM `article` WHERE `id` < 487474 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000579s ]
  12. SELECT * FROM `article` WHERE `id` > 487474 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000396s ]
  13. SELECT * FROM `article` WHERE `id` < 487474 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001554s ]
  14. SELECT * FROM `article` WHERE `id` < 487474 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001775s ]
  15. SELECT * FROM `article` WHERE `id` < 487474 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005087s ]
0.105995s