View Larger Image	Dave Taylor No Starch, Paperback, Published January 2004, 341 pages, ISBN 1593270127
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• Operating Systems : Linux
• Operating Systems : Unix
• Other Topics : Open Source

• No Starch

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's been involved with UNIX and the Internet since 1980, having created the popular Elm Mail System. He'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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