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Linux Beginner

What is Grep?

A command-line utility for searching plain-text data for lines matching a regular expression pattern.

Grep (Global Regular Expression Print) is one of the most used Linux commands. Basic usage: grep "pattern" file. Common flags include -i (case insensitive), -r (recursive), -n (line numbers), -v (invert match), and -c (count).

Extended grep (grep -E or egrep) supports advanced regex. Grep is essential for log analysis, code searching, and text processing. Modern alternatives include ripgrep (rg) which is significantly faster.

Related Terms

AppArmor
A Linux security module that restricts program capabilities using per-application profiles, simpler to configure than SELinux.
GRUB
The Grand Unified Bootloader, a program that loads the operating system kernel into memory during system startup.
Find
A powerful command for searching files and directories based on various criteria like name, size, type, and modification time.
File Permissions
A security mechanism that controls who can read, write, or execute files and directories in Unix-like systems.
Netstat
A command-line tool that displays network connections, routing tables, and interface statistics on a system.
LVM (Logical Volume Manager)
A storage management framework that provides flexible disk management through abstract layers of physical and logical volumes.
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