linux grep命令
1.作用
Linux系统中grep命令是一种强大的文本搜索工具，它能使用正则表达式搜索文本，并把匹 配的行打印出来。grep全称是Global Regular Expression Print，表示全局正则表达式版本，它的使用权限是所有用户。
2.格式
grep [options]
3.主要参数
[options]主要参数：
－c：只输出匹配行的计数。
－I：不区分大 小写(只适用于单字符)。
－h：查询多文件时不显示文件名。
－l：查询多文件时只输出包含匹配字符的文件名。
－n：显示匹配行及 行号。(Linux grep command
1. effect
The grep command in Linux system is a powerful text search tool. It can use regular expressions to search text and print out matching rows. The full name of grep is Global Regular Expression Print, which represents the version of global regular expression, and its permissions are all users.
2. format
Grep [options]
3. main parameters
[options] main parameters:
- C: only output the count of the matched rows.
I: a case insensitive (only applicable to single character).
H: query file does not display the file name.
L: query file contains only output file name, character.
N: display the matching line and line number.)