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Contents

Korn Shell 93

INTRODUCTION AND OVERVIEW

  • Knowing when to use ksh
  • Integrating KornShell scripts with external applications and tools
  • Typical KornShell applications
  • Differences between ksh88 and ksh93
  • Benefits of KornShell vs. other shells

KORNSHELL FUNDAMENTALS

Shell script elements

  • Commands and comments
  • Defining exit values

Conditional program execution

  • Applying if and case statements
  • Simplifying if logic with elif

Program loops and iteration

  • Conditional looping with while and until
  • Pattern matching and list for loops

Testing files and strings

  • Testing file age and permissions
  • Comparing strings
  • Verifying the existence of a string
  • Testing with the [[ ]] command

Debugging

  • Redirecting print as a debugging aid
  • set commands for debugging

STORING AND ACCESSING DATA

Positional parameters

  • Passing and accessing parameters
  • Setting and unsetting parameters
  • Manipulating parameters as groups

Shell variables

  • Defining global and local variables
  • Specifying default values and error conditions
  • Writing reports by setting display characteristics

Arrays

  • Creating and indexing arithmetic arrays
  • Processing array contents with special variables

PROCESSING DATA

Manipulating strings

  • Extracting substrings
  • Determining string length

Mathematics under the KornShell

  • Creating counting while loops
  • Writing mathematical expressions: let vs. (( )), $(( ))

MODULAR PROGRAMMING WITH FUNCTIONS

KornShell function basics

  • Functions vs. scripts
  • Managing your variable namespace

Creating a function library

  • Finding your library with FPATH
  • Building a function library directory

INTERACTING WITH THE OUTSIDE WORLD

Manipulating files and redirecting data

  • Processing command line parameters
  • Deciphering redirection order
  • Unraveling the secrets of exec: opening and closing multiple files

Interacting with running processes

  • Handling error signals
  • Defining post-termination actions such as notification, cleanup
  • Reinitializing or getting status

Accessing network servers

  • Contacting a network server
  • Exchanging data with a network server

CREATING "PRODUCTION QUALITY" SCRIPTS

Ensuring environmental control

  • Checking and modifying environment variables
  • Using getopts to process command line options

Handling user interactions

  • Setting up error processing
  • Employing select to create a menu interface

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Pages in category "Korn Shell 93"

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