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SAMS Teach Yourself Unix in 24 Hours FOURTH EDITION

Name: SAMS Teach Yourself Unix in 24 Hours FOURTH EDITION
Author: Dave Taylor
ISBN: 0672328143

by Dave Taylor

August 2005

Beginner

528 pages

11h 23m

English

Sams

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Copyright
Dedication
About the Author
Acknowledgments
Tell Us What You Think!
Reader Services
Introduction
Does Each Chapter Take an Hour?What If I Take Longer Than 24 Hours?Are There Really 24 Hours Worth of Lessons?How to Use This BookMain SectionTasksWorkshops
1. What Is This Unix Stuff?
Goals for This HourWhat Is Unix?A Brief History of UnixThe C Programming LanguageUnix Becomes PopularWhat's All This About Multiuser Systems?Cracking Open the ShellGetting HelpTask 1.1: Man Pages, Unix Online ReferenceTask 1.2: Other Ways to Find Help in UnixSummaryWorkshopKey TermsExercisesPreview of the Next Hour
2. Getting onto the System and Using the Command Line
Goals for This HourBeginning Your SessionTask 2.1: Logging In and Out of the SystemTask 2.2: Changing Passwords with passwdTask 2.3: Picking a Secure PasswordSeeing What's Going On Around YouTask 2.4: Who Are You?Task 2.5: Finding Out What Other Users Are Logged In to the SystemTask 2.6: What Is Everyone Doing on the Computer?Task 2.7: Checking the Current Date and TimeSummaryWorkshopKey TermsExercisesPreview of the Next Hour
3. Moving About the File System
Goals for This HourWhat a Hierarchical File System Is All AboutTask 3.1: The Unix File System OrganizationThe bin DirectoryThe dev DirectoryThe etc DirectoryThe lib DirectoryThe lost+found DirectoryThe mnt and sys DirectoriesThe tmp DirectoryThe usr DirectoryOther Miscellaneous Stuff at the Top LevelDirectory Separator CharactersThe Difference Between Relative and Absolute FilenamesTask 3.2: Hidden Files in UnixTask 3.3: The Special Directories . and ..Task 3.4: The env CommandTask 3.5: PATH and HOMETask 3.6: Find Where You Are with pwdTask 3.7: Moving to Another Location with cdSummaryWorkshopKey TermsExercisesPreview of the Next Hour
4. Listing Files and Managing Disk Usage
Goals for This HourThe ls CommandTask 4.1: All About the ls CommandTask 4.2: Having ls Tell You MoreTask 4.3: Combining FlagsTask 4.4: Listing Other Directories Without Changing LocationSpecial ls Command FlagsTask 4.5: Changing the Sort Order in lsTask 4.6: Listing Directory Trees Recursively in lsTask 4.7: Long Listing Format in lsPermissions StringsTask 4.8: Long Listing Format for Directories in lsTask 4.9: Creating Files with the touch CommandTask 4.10: Checking Disk Space Usage with duTask 4.11: Checking Available Disk Space with dfTask 4.12: Shrinking Big Files with the gzip ProgramSummaryWorkshopKey TermsExercisesPreview of the Next Hour
5. Ownership and Permissions
Goals for This HourWorking with File PermissionsTask 5.1: Understanding File Permissions SettingsTask 5.2: Directory Permissions SettingsTask 5.3: Modifying File and Directory Permissions with chmodTask 5.4: Setting New File Permissions with chmodTask 5.5: Calculating Numeric Permissions StringsTask 5.6: Establishing Default File and Directory Permissions with the umask CommandTask 5.7: Identifying Owner and Group for Any File or DirectorySummaryWorkshopKey TermsExercisesPreview of the Next Hour

6. Creating, Moving, Renaming, and Deleting Files and Directories
Goals for This HourManipulating the Unix File SystemTask 6.1: Creating New Directories Using mkdirTask 6.2: Copying Files to New Locations Using cpTask 6.3: Moving Files to New Locations Using mvTask 6.4: Renaming Files with mvTask 6.5: Removing Directories with rmdirTask 6.6: Removing Files Using rmTask 6.7: Minimizing the Danger of the rm CommandSummaryWorkshopKey TermsExercisesPreview of the Next Hour
7. Looking into Files
Goals for This HourLooking Inside FilesTask 7.1: Using file to Identify File TypesTask 7.2: Exploring Unix Directories with fileTask 7.3: Peeking at the First Few Lines with headTask 7.4: Viewing the Last Few Lines with tailTask 7.5: Viewing the Contents of Files with catTask 7.6: Viewing Larger Files with moreSummaryWorkshopKey TermsExercisesPreview of the Next Hour
8. Filters, Pipes, and Wildcards!
Goals for This HourMaximizing the Command LineTask 8.1: The Secrets of File RedirectionTask 8.2: Counting Words and Lines Using wcTask 8.3: Sorting Information in a File Using sortTask 8.4: Filename WildcardsTask 8.5: Searching Files With grepTask 8.6: Creating Regular ExpressionsTask 8.7: The Rest of the grep FamilySummaryWorkshopKey TermsExercisesPreview of the Next Hour
9. Slicing and Dicing Command-Pipe Data
Goals for This HourThe awk Programming SystemTask 9.1: Learning to Use awkHow to Use cut in PipesAction 9.2: Slicing and Dicing with cutInline Editing with sed and trAction 9.3: Inline Editing with sed and trSummaryWorkshopExercisesPreview of the Next Hour
10. An Introduction to the vi Editor
Goals for This HourEditing the Unix WayTask 10.1: How to Start and Quit viTask 10.2: Simple Cursor Motion in viTask 10.3: Moving by Words and PagesTask 10.4: Inserting Text into the File Using i, a, o, and OTask 10.5: Deleting TextSummaryWorkshopKey TermsExercisesPreview of the Next Hour
11. Advanced vi Tricks, Tools, and Techniques
Goals for This HourAdvanced Editing with viTask 11.1: Searching Within a FileTask 11.2: The Colon Commands in viTask 11.3: How to Start vi CorrectlyTask 11.4: Search and ReplaceTask 11.5: The Change and Replace CommandsTask 11.6: Accessing Unix with !Summary of vi CommandsSummaryWorkshopKey TermsExercisesPreview of the Next Hour
12. An Overview of the emacs Editor
Goals for This HourThe Other Popular Editor: emacsTask 12.1: Launching emacs and Inserting TextTask 12.2: How to Move Around in a FileTask 12.3: How to Delete Characters and WordsTask 12.4: Search and Replace in emacsTask 12.5: Using the emacs Tutorial and Help SystemTask 12.6: Working with Other FilesSummaryWorkshopKey TermsExercisesPreview of the Next Hour
13. Introduction to Command Shells
Goals for This HourThe (Command) Shell GameTask 13.1: What Shells Are Available?Task 13.2: Identifying Your ShellTask 13.3: How to Choose a New ShellTask 13.4: Learning the Shell EnvironmentTask 13.5: Exploring bash Configuration FilesSummaryWorkshopKey TermsExercisesPreview of the Next Hour
14. Advanced Shell Interaction
Goals for This HourWhich Shell Is Which?Task 14.1: The Shell History MechanismsTask 14.2: Using History to Cut Down on TypingTask 14.3: Command AliasesTask 14.4: Some Power AliasesTask 14.5: Setting Custom PromptsSummaryWorkshopKey TermsExercisesPreview of the Next Hour
15. Job Control
Goals for This HourWrestling with Your JobsTask 15.1: Job Control in the Shell: Stopping JobsTask 15.2: Foreground/Background and Unix ProgramsTask 15.3: Finding Out What Tasks Are RunningTask 15.4: Terminating Processes with killSummaryWorkshopKey TermsExercisesPreview of the Next Hour
16. Shell Programming Overview
Goals for This HourBuild Your Own CommandsTask 16.1: Shell VariablesTask 16.2: Shell ArithmeticTask 16.3: Comparison FunctionsTask 16.4: Conditional ExpressionsTask 16.5: Looping ExpressionsTask 16.6: bash FunctionsSummaryWorkshopKey TermsExercisesPreview of the Next Hour
17. Advanced Shell Programming
Goals for This HourSearching a Database of Filenames with mylocateTask 17.1: Building mylocateTask 17.2: How Many Commands Do You Have?Task 17.3: How Much Disk Space Do We Have Left?Task 17.4: Let's Play a (Shell Script) Game!SummaryWorkshopKey TermsExercisesPreview of the Next Hour
18. Printing in the Unix Environment
Goals for This HourMaking a Printed CopyTask 18.1: Find Local Printers with printersTask 18.2: Printing Files with lpr or lpTask 18.3: Formatting Print Jobs with pr and colTask 18.4: Working with the Print QueueSummaryWorkshopKey TermsExercisesPreview of the Next Hour
19. Archives and Backups
Goals for This HourThe tar Tape Archive UtilityTask 19.1: Learning to Use tarShrinking Your Files with compressAction 19.2: Shrinking Large Files on UnixExploring the Unix Tape Command: cpioAction 19.3: A Quick Exploration of cpioPersonal Backup SolutionsAction 19.4: A Personal Backup SchemeWorking with Unix Package ManagersAction 19.5: A Visit with the RPM Package ManagerSummaryWorkshopExercisesPreview of the Next Hour
20. Communicating with Email
Goals for This HourInteracting with the WorldTask 20.1: Reading Electronic Mail with mailxTask 20.2: Sending Mail from the Command LineTask 20.3: Internet Email AddressesTask 20.4: The Smarter Electronic Mail Alternative, elmTask 20.5: A Glimpse of PineSummaryWorkshopKey TermsExercisesPreview of the Next Hour
21. Using telnet, SSH, and ftp
Goals for This HourStepping Beyond Your Own SystemTask 21.1: Connecting to Remote Internet SitesTask 21.2: Telnet from Windows and MacsTask 21.3: Secure Connections with SSHTask 21.4: Copying Files with FTPTask 21.5: Exploring Anonymous FTP ArchivesSummaryWorkshopKey TermsExercisesPreview of the Next Hour
22. Searching for Information and Files
Goals for This HourFinding What's WhereTask 22.1: The find Command and Its Weird OptionsTask 22.2: Using find with xargsTask 22.3: Getting Files from the InternetSummaryWorkshopExercisesPreview of the Next Hour
23. Perl Programming in Unix
Goals for This HourFlexible and Powerful: PerlTask 23.1: Exchange, a Demonstration Currency Translator Written in PerlTask 23.2: Checking Code Quality with -wTask 23.3: Online Perl Documentation and InformationTask 23.4: Other Useful Perl CommandsSummaryWorkshopKey TermsExercisesPreview of the Next Hour
24. GNOME and the GUI Environment
Goals for This HourTweaking Your Inner GNOMETask 24.1: Getting Started with X11 and GNOMETask 24.2: Fine-tuning Your GNOME ConfigurationWorking with GNOME ApplicationsTask 24.3: Working with OpenOffice.orgTask 24.4: The Firefox Web BrowserTask 24.5: Using the Evolution Email ProgramSummaryCongratulations!WorkshopKey TermsExercises
A. Common Unix Questions and Answers
How do I use find|xargs with filenames that contain spaces?How do I find large files on my system?How do I run a program on a schedule?The at CommandCronHow do fix file permission problems?How do I list files that don't match a given pattern?How do I view lines X-Y in a text file?How do I add a new directory to my PATH?How do I recover deleted files?How can I set my shell to protect me from accidental deletions?What do the shell errors “arg list too long” and “broken pipe” mean?Why use ssh instead of telnet? Or sftp instead of ftp?Summary
B. Working with the Apache Web Server
Goals for This HourWorking with a Unix Web ServerTask B.1: Exploring Apache Configuration FilesTask B.2: Creating a Simple CGI ProgramTask B.3: A Server-Side Include ProgramTask B.4: Understanding Apache Log FilesSummaryWorkshopKey Terms

Content preview from SAMS Teach Yourself Unix in 24 Hours FOURTH EDITION

Chapter 16. Shell Programming Overview

In the preceding few hours, you have learned about some of the many options available to you when you use a command shell. Using these shells enables you to enter commands for Unix. What most people don't realize when they first start using Unix is that these shells are also programming environments and that you can write your own shell programs with remarkably little effort. And, oh yeah, it's really fun too.

Goals for This Hour

In this hour, you will learn all about

Shellvariables
Shell arithmetic
Comparison functions
Conditional expressions
Looping expressions
bash functions

Because shells are really just interpreted languages, any sequence of commands you want to run can be placed in a file and run regularly. ...

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SAMS Teach Yourself Unix in 24 Hours FOURTH EDITION

by Dave Taylor

Chapter 16. Shell Programming Overview

Goals for This Hour

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.