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Fun and functional Linux, Mac OS X and UNIX shell scripts

The UNIX shell is the main scripting environment of every Linux, Mac OS X and UNIX system, whether a rescued laptop or a million-dollar mainframe. This cookbook of useful, customizable, and fun scripts gives you the tools to solve common Linux, Mac OS X and UNIX problems and personalize your computing environment. Among the more than 100 scripts included are an interactive calculator, a spell checker, a disk backup utility, a weather tracker, and a web logfile analysis tool. The book also teaches you how to write your own sophisticated shell scripts by explaining the syntax and techniques used to build each example scripts. Examples are written in Bourne Shell (sh) syntax. .

About the Author .

Dave Taylor is a popular writer, teacher and speaker of business and technology issues. The founder of The Internet Mall and iTrack.com, he& 8217;s been involved with UNIX and the Internet since 1980, having created the popular Elm Mail System. He& 8217;s also been a Mac fan since the year it was released. Once a Research Scientist at HP Laboratories and Senior Reviews Editor of SunWorld magazine, Taylor has contributed software to the official 4.4 release of Berkeley Unix (BSD). His programs are found in all versions of Linux and other popular Unix variants. .

Table of Contents

Chapter 1: The Missing Code Library .

Script 1 Finding Programs in the PATH

Script 2 Validating Input: Alphanumeric Only

Script 3 Normalizing Date Formats

Script 4 Presenting Large Numbers Attractively

Script 5 Validating Integer Input

Script 6 Validating Floating-Point Input

Script 7 Validating Date Formats

Script 8 Sidestepping Poor Echo Implementations

Script 9 An Arbitrary-Precision Floating-Point Calculator

Script 10 Locking Files

Script 11 ANSI Color Sequences

Script 12 Building a Shell Script Library

Script 13 Debugging Shell Scripts .

Chapter 2: Improving on User Commands .

Script 14 Formatting Long Lines

Script 15 Archiving Files As They’re Removed

Script 16 Working with the Removed File Archive

Script 17 Logging File Removals

Script 18 Displaying the Contents of Directories

Script 19 Locating Files by Filename

Script 20 Emulating Another Environment: DIR

Script 21 Digging Around in the Man Page Database

Script 22 Displaying the Time in Different Time Zones .

Chapter 3: Creating Utilities .

Script 23 A Reminder Utility

Script 24 An Interactive Calculator

Script 25 Checking the Spelling of Individual Words

Script 26 Shpell: An Interactive Spell-Checking Facility

Script 27 Adding a Local Dictionary to Spell

Script 28 Converting Temperatures

Script 29 Calculating Loan Payments

Script 30 Keeping Track of Events .

Chapter 4: Tweaking Unix .

Script 31 Displaying a File with Line Numbers

Script 32 Displaying a File with Additional Information

Script 33 Wrapping Only Long Lines

Script 34 Emulating GNU-Style Flags with Quota

Script 35 Making sftp Look More Like ftp

Script 36 Fixing grep

Script 37 Working with Compressed Files

Script 38 Ensuring Maximally Compressed Files (PDF) .

Chapter 5: System Administration: Managing Users .

Script 39 Analyzing Disk Usage

Script 40 Reporting Disk Hogs

Script 41 Figuring Out Available Disk Space

Script 42 Improving the Readability of df Output

Script 43 Implementing a Secure Locate

Script 44 Adding Users to the System

Script 45 Suspending a User Account

Script 46 Deleting a User Account

Script 47 Validating the User Environment

Script 48 Cleaning Up After Guests Leave .

Chapter 6: System Administration: System Maintenance .

Script 49 Tracking Set User ID Applications

Script 50 Setting the System Date

Script 51 Displaying Which Services Are Enabled

Script 52 Killing Processes by Name

Script 53 Validating User crontab Entries

Script 54 Ensuring That System cron Jobs Are Run

Script 55 Rotating Log Files

Script 56 Managing Backups

Script 57 Backing Up Directories .

Chapter 7: Web and Internet Users .

Script 58 Calculating Time Spent Online

Script 59 Downloading Files via FTP

Script 60 Tracking BBC News with lynx (PDF)

Script 61 Extracting URLs from a Web Page

Script 62 Defining Words Online

Script 63 Keeping Track of the Weather

Script 64 Checking for Overdue Books at the Library

Script 65 Digging Up Movie Info from IMDb

Script 66 Calculating Currency Values

Script 67 Tracking Your Stock Portfolio

Script 68 Tracking Changes on Web Pages .

Chapter 8: Webmaster Hacks .

Script 69 Seeing the CGI Environment

Script 70 Logging Web Events

Script 71 Building Web Pages on the Fly

Script 72 Processing Contact Forms

Script 73 Creating a Web-Based Photo Album

Script 74 Building a Guest Book

Script 75 Creating a Text-Based Web Page Counter

Script 76 Displaying Random Text .

Chapter 9: Web and Internet Administration .

Script 77 Identifying Broken Internal Links

Script 78 Reporting Broken External Links

Script 79 Verifying Spelling on Web Pages

Script 80 Managing Apache Passwords

Script 81 Synchronizing Directories with FTP

Script 82 Synchronizing to a Remote Directory via FTP

Script 83 Synchronizing Files with SFTP .

Chapter 10: Internet Server Administration .

Script 84 Exploring the Apache access_log (PDF)

Script 85 Understanding Search Engine Traffic

Script 86 Exploring the Apache error_log

Script 87 Avoiding Disaster with a Remote Archive

Script 88 Mirroring a Website

Script 89 Tracking FTP Usage

Script 90 Monitoring Network Status

Script 91 Renicing Tasks by Process Name

Script 92 Adding New Virtual Host Accounts .

Chapter 11: Mac OS X Scripts .

Script 93 List NetInfo Users

Script 94 Adding a User to a Mac OS X System

Script 95 Adding an Email Alias

Script 96 Set the Terminal Title Dynamically

Script 97 Producing Summary Listings of iTunes Libraries

Script 98 Fixing the Open Command .

Chapter 12: Shell Script Fun and Games .

Script 99 Unscramble (PDF)

Script 100 Guess the Word Before It’s Too Late: Hangman

Script 101 A State Capitals Quiz .

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