Expert Shell Scripting

There are tens of thousands of Linux and Unix system administrators who are pressed for time and need an immediate fix. Expert Shell Scripting offers quick and easy solutions to many common (but challenging) problems that would otherwise take hours to solve.

System administrators need libraries of solutions that are ingenious but understandable. They don't want to reinvent the wheel, but they don't want to reinvent filesystem management either! Expert Shell Scripting is the ultimate resource for all working Linux, Unix, and OS X system administrators who would like to have short, succinct, and powerful shell implementations of tricky system scripting tasks.

• Automating small to medium system management tasks
• Analyzing system data and editing configuration files

• Scripting Linux, Unix, and OS X applications using bash, ksh, et al.

  Solutions for urgent Unix/Linux management problems by a scripting guru Cuts across Linux/Unix flavors, common shells and programming approaches Avoids How-To, cuts to the chase A treasure trove of expandable shell scripts

  Autorentext
  Ron Peters spent more than ten years administering Linux and Unix systems while building a very large library of shell scripts. He realized that the world is full of how-to documents, but not many seem to read them, nor can many system administrators lay claim to being shell scripting experts. He apologizes that it took him so long to make his efforts known to the world. He is married with two children and very happy that he found the time to write this book.

  Inhalt
  Basic Scripting Techniques.- Shell Script Debugging.- Standard Function Library.- Date and Time Manipulation.- Comparisons and Tests.- Accepting Command-Line Options, Switches, and Parameters.- Testing Variables and Assigning Defaults.- Indirect Reference Variables.- Shell Process Tree.- Data Redirection.- Piping Input to read.- System Interaction and Advanced Techniques.- Math from the Shell.- cron.- Self-Linked Scripts.- Throttling Parallel Processes.- Command-Line Editing and History.- Scripting from the Command Line.- Automating User Input with expect.- User Input Timeout.- Instant Keyboard Response.- Directory Copying.- A Brief Tour of the X Display Environment.- X Navigation Window.- Command-Line E-mail Attachments.- Text-Processing One-Liners.- Editing Files in Place.- Evaluating Variables in a Flat File.- Read Piped Input.- Free-Format Output Using cat.- Automating Interactive Processes.- Useful Scripts.- Automating E-mail with procmail.- Process-Management Monitor.- Managing File Counts.- Processes Running from inittab.- Automatic RCS.- Colorful /proc Reporting.- Password-Aging Notification.- A Pseudo-shadow File.- Linux Gold-System Build.- System Snapshots.- Removing Large Files and Log Rolling.- Core Finder.- Network Adapter Failover.