Introductory Korn Shell Programming

Who should use this book? This book is for anyone who wants to learn how to program in the Korn Shell. While many of the examples will carry over to other shells, this book focuses on Korn Shell. What is covered in this book? + The Korn Shell command interpretor + Scripts, external functions, internal functions + Variables and arrays + Program input, output, error, and parameter handling + Conditional and looping logic + In-line commands and statements + String and integer operations + Using the trap command + Using grep and egrep + Basic sed and awk programming + Many utilities

This Nutshell Handbook® is a thorough introduction to the Korn shell, both as a user interface and as a programming language.The Korn shell, like the C and Bourne shells, is a program that interprets UNIX commands. It has many features that aren't found in other shells, including command history (the ability to recall and edit previous commands). The Korn shell is also faster; several of its features allow you to write programs that execute more quickly than their Bourne or C shell equivalents.This book provides a clear and concise explanation of the Korn shell's features. It explains ksh string operations, co-processes, signals and signal handling, and one of the worst "dark corners" of shell programming: command-line interpretation. It does this by introducing simple real-life examples and then adding options and complexity in later chapters, illustrating the way real-world script development generally proceeds. An additional (and unique) programming aid, a Korn shell debugger (kshdb), is also included.Learning the Korn Shell is an ideal resource for many UNIX users and programmers, including software developers who want to "prototype" their designs, system administrators who want to write tools for their own use, and even novices who just want to use some of ksh's more advanced interactive features.

Who should use this book? This book is for anyone who wants to learn how to program in the Korn Shell. While many of the examples will carry over to other shells, this book focuses on Korn Shell. What is covered in this book? + The Korn Shell command interpretor + Scripts, external functions, internal functions + Variables and arrays + Program input, output, error, and parameter handling + Conditional and looping logic + In-line commands and statements + String and integer operations + Using the trap command + Using grep and egrep + Basic sed and awk programming + Many utilities, including bcp and an ASE backup utility for 12.5.2 and 12.5.3

UNIX expert Randal K. Michael guides you through every detail of writing shell scripts to automate specific tasks. Each chapter begins with a typical, everyday UNIX challenge, then shows you how to take basic syntax and turn it into a shell scripting solution. Covering Bash, Bourne, and Korn shell scripting, this updated edition provides complete shell scripts plus detailed descriptions of each part. UNIX programmers and system administrators can tailor these to build tools that monitor for specific system events and situations, building solid UNIX shell scripting skills to solve real-world system administration problems.

"Learning the Korn Shell" is the key to the Korn shell and becoming adept at using it as an interactive command and scripting language. Readers will learn how to write many applications more easily and quickly than with other high-level languages. This newly revised title inherits a long tradition of trust among computer professionals.

This is a tutorial and technical reference manual for the KornShell, with lots of examples to get UNIX shell programmers started. This edition features a redesigned layout and includes all source code for programs and examples.

Learn how to develop powerful and robust shell scripts in order to get the most out of your Unix/Linux system.