Wicked Cool Shell Scripts: 101 Scripts for Linux, Mac OS X and Unix Systems

Description

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’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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