Unlock Linux Mastery: A Mythical Guide to Command‑Line Essentials

Chapter 1: The Awakening – Linux Basics

Condensing Qi into Runes : Master basic Linux commands.

Mysterious Queries : Learn to use help and man for assistance.

Heaven‑Shifting : Move files and directories with cp, rm, mv.

Divine Insight : View file contents using cat, grep, etc.

Time Reversal : Backup and restore with tar, gzip.

Void Creation : Master the vi editor’s three modes.

Chapter 2: Foundations – Command Overview

First Layer: Core Commands (Internal)

Commands built into the shell, such as pwd and cd, are always available without external binaries.

Second Layer: External Commands (External)

Binary executables stored in directories like /bin or /usr/bin, e.g., ls and vim.

Command Syntax

command [options] [arguments]

Command core : the command name, e.g., ls, cp.

Option (flag) : short form like -l or long form like --help.

Argument : the target, e.g., /home/仙府.

Advanced Tips

Use Tab for auto‑completion.

Press Ctrl+C to abort a running command.

Press Ctrl+L to clear the terminal.

Chapter 3: Realm of Directories and Files

Level One – Viewing the Landscape

pwd

: Show the current directory. cd: Change directory. ls -l: List files with permissions, size, timestamps. du -sh: Display disk usage of a directory.

Level Two – Creation Magic

mkdir -p /秘境/灵泉/药田

: Create nested directories. touch filename: Create an empty file. ln -s source target: Create a symbolic link.

Level Three – Transfer and Destruction

cp -r source dest

: Recursively copy a directory. rm -rf path: Forcefully remove files or directories (use with extreme caution). mv source dest: Move or rename files/directories.

Level Four – Searching the Ether

which command

: Locate the executable path, e.g., which ls → /usr/bin/ls. find /path -name "*.txt" -size +10M: Find files matching name patterns and size criteria.

Chapter 4: Time‑Travel – Backup and Restore

tar -zcvf backup.tar.gz /source

: Create a gzip‑compressed archive. tar -jcvf backup.tar.bz2 /source: Create a bzip2‑compressed archive. tar -zxvf backup.tar.gz -C /dest: Extract an archive to a specified directory.

Chapter 5: Void Creation – The vi Editor

Three Realms of vi

Command mode (default) dd: Delete the current line. yy then p: Yank (copy) a line and paste. /pattern: Search for a string.

Insert mode (press i)

Type freely; press Esc to return to command mode.

Command‑line mode (press :) :wq: Write changes and quit. :%s/old/new/g: Replace all occurrences of a pattern.

Chapter 6: Ascension – Final Thoughts

Mastering Linux requires frequent practice ( man, --help) and a solid grasp of the command line and vi editor. With a strong foundation, you can confidently manage servers, automate tasks, and become a true operations specialist.