Mastering Unix Shell Scripting

Randal K. Michael is a UNIX Systems Administrator working as a contract consultant. He teaches UNIX shell scripting in corporate settings, where he writes shell scripts to address a variety of problems and tasks ranging from monitoring systems to replicating large databases. He has more than 30 years of experience in the industry and 15 years of experience as a UNIX Systems Administrator, working on AIX, HP-UX, Linux, OpenBSD, and Solaris.

• Acknowledgments xxvIntroduction xxviiPart One The Basics of Shell ScriptingChapter 1 Scripting Quick Start and Review 3Chapter 2 24 Ways to Process a File Line-by-Line 67Chapter 3 Automated Event Notification 131Chapter 4 Progress Indicators Using a Series of Dots, a Rotating Line, or Elapsed Time 143Part Two Scripts for Programmers, Testers, and AnalystsChapter 5 Working with Record Files 157Chapter 6 Automated FTP Stuff 187Chapter 7 Using rsync to Efficiently Replicate Data 219Chapter 8 Automating Interactive Programs with Expect and Autoexpect 291Chapter 9 Finding Large Files and Files of a Specific Type 325Chapter 10 Process Monitoring and Enabling Pre-Processing, Startup, and Post-Processing Events 335Chapter 11 Pseudo-Random Number and Data Generation 369Chapter 12 Creating Pseudo-Random Passwords 401Chapter 13 Floating-Point Math and the bc Utility 433Chapter 14 Number Base Conversions 475Chapter 15 hgrep: Highlighted grep Script 515Chapter 16 Monitoring Processes and Applications 527Part Three Scripts for Systems AdministratorsChapter 17 Filesystem Monitoring 553Chapter 18 Monitoring Paging and Swap Space 603Chapter 19 Monitoring System Load 641Chapter 20 Monitoring for Stale Disk Partitions (AIX-Specific) 677Chapter 21 Turning On/Off SSA Identification Lights 697Chapter 22 Automated Hosts Pinging with Notification of Failure 723Chapter 23 Creating a System-Configuration Snapshot 741Chapter 24 Compiling, Installing, Configuring, and Using sudo 777Chapter 25 Print-Queue Hell: Keeping the Printers Printing 809Chapter 26 Those Pesky Sarbanes-Oxley (SOX) Audits 851Chapter 27 Using Dirvish with rsync to Create Snapshot-Type Backups 867Chapter 28 Monitoring and Auditing User Keystrokes 935Appendix A What’s on the Web Site 955Index 977