Practical Guide to Linux Commands, Editors, and Shell Programming, A

The Most Useful Tutorial and Reference, with Hundreds of High-Quality Examples for Every Popular Linux Distribution

"First Sobell taught people how to use Linux . . . now he teaches you the power of Linux. A must-have book for anyone who wants to take Linux to the next level."

-Jon "maddog" Hall, Executive Director, Linux International Discover the Power of Linux-Covers macOS, too!

• Learn from hundreds of realistic, high-quality examples, and become a true command-line guru
• Covers MariaDB, DNF, and Python 3
• 300+ page reference section covers 102 utilities, including macOS commands
  For use with all popular versions of Linux, including Ubuntu,(TM) Fedora,(TM) openSUSE,(TM) Red Hat,® Debian, Mageia, Mint, Arch, CentOS, and macOS

Linux is today's dominant Internet server platform. System administrators and Web developers need deep Linux fluency, including expert knowledge of shells and the command line. This is the only guide with everything you need to achieve that level of Linux mastery. Renowned Linux expert Mark Sobell has brought together comprehensive, insightful guidance on the tools sysadmins, developers, and power users need most, and has created an outstanding day-to-day reference, updated with assistance from new coauthor Matthew Helmke.

This title is 100 percent distribution and release agnostic. Packed with hundreds of high-quality, realistic examples, it presents Linux from the ground up: the clearest explanations and most useful information about everything from filesystems to shells, editors to utilities, and programming tools to regular expressions.

Use a Mac? You'll find coverage of the macOS command line, including macOS-only tools and utilities that other Linux/UNIX titles ignore.

A Practical Guide to Linux® Commands, Editors, and Shell Programming, Fourth Edition, is the only guide to deliver

• A MariaDB chapter to get you started with this ubiquitous relational database management system (RDBMS)
• A masterful introduction to Python for system administrators and power users
• In-depth coverage of the bash and tcsh shells, including a complete discussion of environment, inheritance, and process locality, plus coverage of basic and advanced shell programming
• Practical explanations of core utilities, from aspell to xargs, including printf and sshfs/curlftpfs, PLUS macOS-specific utilities from ditto to SetFile
• Expert guidance on automating remote backups using rsync
• Dozens of system security tips, including step-by-step walkthroughs of implementing secure communications using ssh and scp
• Tips and tricks for customizing the shell, including step values, sequence expressions, the eval builtin, and implicit command-line continuation
• High-productivity editing techniques using vim and emacs
• A comprehensive, 300-plus-page command reference section covering 102 utilities, including find, grep, sort, and tar
• Instructions for updating systems using apt-get and dnf
• And much more, including coverage of BitTorrent, gawk, sed, find, sort, bzip2, and regular expressions

Auteur

Mark G. Sobell has forty years of experience working with UNIX and Linux systems and is the author of many best-selling books, including A Practical Guide to Fedora™ and Red Hat® Enterprise Linux®, Seventh Edition, and A Practical Guide to Ubuntu Linux®, Fourth Edition.

Matthew Helmke got his first computer in 1981, a TRS-80 Color Computer. He started using UNIX in 1987 while studying LISP. He works as a technical writer and has written about Linux and other topics for magazines and a diverse set of companies. He is the author of several books, including Ubuntu Unleashed, The Official Ubuntu Book, and VMware Cookbook.

Contenu

Preface xxxv

Chapter 1: Welcome to Linux and macOS 1

The History of UNIX and GNU-Linux 3

What Is So Good About Linux? 6

Overview of Linux 11

Additional Features of Linux 16

Chapter Summary 18

Exercises 18

Part I: The Linux and macOS Operating Systems 21

Chapter 2: Getting Started 23

Conventions Used in This Book 24

Logging In from a Terminal (Emulator) 26

Working from the Command Line 28

su/sudo: Curbing Your Power (root Privileges) 32

Where to Find Documentation 33

More About Logging In and Passwords 42

Chapter Summary 46

Exercises 47

Advanced Exercises 48

Chapter 3: The Utilities 49

Special Characters 50

Basic Utilities 51

Working with Files 53

| (Pipeline): Communicates Between Processes 60

Four More Utilities 61

Compressing and Archiving Files 64

Locating Utilities 69

Displaying User and System Information 71

Communicating with Other Users 75

Email 77

Chapter Summary 77

Exercises 80

Advanced Exercises 81

Chapter 4: The Filesystem 83

The Hierarchical Filesystem 84

Directory Files and Ordinary Files 85

Pathnames 90

Working with Directories 92

Access Permissions 100

ACLs: Access Control Lists 106

Links 112

Chapter Summary 122

Exercises 124

Advanced Exercises 126

Chapter 5: The Shell 127

Special Characters 128

Ordinary Files and Directory Files 129

The Command Line 130

Standard Input and Standard Output 137

Running a Command in the Background 150

Filename Generation/Pathname Expansion 152

Builtins 157

Chapter Summary 158

Exercises 159

Advanced Exercises 160

Part II: The Editors 163

Chapter 6: The vim Editor 165

History 166

Tutorial: Using vim to Create and Edit a File 167

Introduction to vim Features 175

Command Mode: Moving the Cursor 181

Input Mode 185

Command Mode: Deleting and Changing Text 186

Searching and Substituting 190

Miscellaneous Commands 197

Copying, Moving, and Deleting Text 197

Reading and Writing Files 200

Setting Parameters 201

Advanced Editing Techniques 206

Units of Measure 210

Chapter Summary 213

Exercises 218

Advanced Exercises 219

Chapter 7: The emacs Editor 221

History 222

Tutorial: Getting Started with emacs 224

Basic Editing Commands 231

Online Help 238

Advanced Editing 240

Major Modes: Language-Sensitive Editing 255

Customizing emacs 265

More Information 270

Chapter Summary 270

Exercises 279

Advanced Exercises 280

Part III: The Shells 283

Chapter 8: The Bourne Again Shell (bash) 285

Background 286

Startup Files 288

Commands That Are Symbols 291

Redirecting Standard Error 292

Writing and Executing a Simple Shell Script 294

Control Operators: Separate and Group Commands 299

Job Control 304

Manipulating the Directory Stack 307

Parameters and Variables 310

Special Characters 325

Locale 326

Time 330

Processes 333

History 336

Aliases 352

Functions 356

Controlling bash: Features and Options 359

Processing the Command Line 364

Chapter Summary 374

Exercises 376

Advanced Exercises 378

Chapter 9: The TC Shell (tcsh) 379

Shell Scripts 380

Entering and Leaving the TC Shell 381

Features Common to the Bourne Again and TC Shells 383

Redirecting Standard Error 389

Working with the Command Line 390

Variables 396

Control Structures 408

Builtins 418

Chapter Summary 422

Exercises 423

Advanced Exercises 425

Part IV: Programming Tools 427

Chapter 10: Programming the Bourne Again Shell (bash) 429

Control Structures 430

File Descriptors 464

Parameters 470

Variables 479

Builtin Commands 489

Expressions 505

Implicit Command-Line Continuation 512

Shell Programs 513

Chapter Summary 523

Exercises 525

Advanced Exercises 527

Chapter 11: The Perl Scripting Language 529

Introduction to Perl 530

Variables 538

Control Structures 545

Working with Files 554

Sort 558

Subroutines 559

Regular Expressions 562

CPAN Modules 568

Examples 570

Chapter Summary 574

Exercises 574

Advanced Exercises 57…