Essential Linux Commands and Directory Guide

1. Linux Directory Structure

The Linux filesystem follows a standard hierarchy. Key top‑level directories include:

bin – binary executables for all users.

sbin – system binaries, typically accessed by root.

etc – configuration files.

usr – shared system resources.

home – user home directories.

root – root user’s home.

dev – device files.

lib – shared libraries and kernel modules.

mnt – mount points for temporary filesystems.

boot – boot loader files.

tmp – temporary files.

var – variable data such as logs and caches.

2. Common Linux Commands

Command syntax follows the pattern command -options arguments, where options and arguments are optional. Example: ls -la /usr The article includes visual tables of file‑operation commands and system utilities (images omitted for brevity).

2.1 File and Directory Operations

2.2 Common System Commands

2.3 Compression and Decompression

2.4 File Permission Operations

Permissions are expressed as rwx for read, write, execute, and can be represented numerically (e.g., 764). The first character indicates file type (d for directory, - for regular file, l for link). Subsequent three‑character groups represent user (u), group (g), and others (o) permissions, with a denoting all.

3. Vim Editor Overview

Vim is a powerful, modal text editor commonly used on Linux. It operates entirely via keyboard commands without graphical menus.

3.1 Editing Text

3.2 Navigation Commands

3.3 Replace and Undo

3.4 Delete Commands

3.5 Common Shortcuts

These sections collectively provide a quick‑reference guide for anyone needing to navigate Linux filesystems, execute common shell commands, manage permissions, and use Vim efficiently.