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Introduction

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Contract sections
1.What is a shell script
2.Why use shell scripts
 Typical uses
3.History
4.Feature comparison
  Core Similarities (and recap of basic command line usage)
  Principal Differences
5.Other scripting languages
6.ksh/bash vs sh
7.Basics
 Exit status
8.Filename Wildcards
9.Variables
  Setting and exporting variables
  Using variables
  Conditional modifiers
  Variable assignment command prefix
10.Preset Variables
 Login environment
 Shell internal settings
 Process ID variables
 ksh/bash additional features
11.Arguments
 Setting new positional arguments
12.Shell options
13.Command substitution
  sh syntax
  ksh/bash syntax
14.I/O redirection and pipelines
 Output redirection
 Input redirection
 Command pipelines
15.Input and output
  Script output
  Script input
16.Conditional Tests
  File tests
  Character string tests
17.Conditional Tests (contd.)
  Arithmetic tests
  Additional tests for [[...]] (ksh and bash)
  Negating and Combining tests
18.Flow control
  Conditional execution: if/else
  Looping: 'while' and 'for' loops
19.Flow control (contd.)
  Case statement: pattern matching
  Miscellaneous flow control and subshells
20.Conditional test examples
21.Miscellaneous
22.Manipulating Variables
 Text variables
 Numeric variables
23.Functions
  Defining functions
  Calling functions.
  Reuseable functions
24.Advanced I/O
  Redirecting for the whole script
  Explicitly opening or duplicating file descriptors
  Input and output to open file descriptors (ksh)
  Closing file handles
  
25.Wizard I/O
  Pass stderr of a command into a pipeline for further processing
  Capture the exit status of a command in the middle of a pipeline
26.Coprocesses
  ksh coprocesses
27.Arrays
28.Signals
29.Security
30.Style
 When not to use shell scripts
31.Examples
32.Common external commands
  Listing, copying and moving files and directories
  Displaying text, files or parts of files
  Compression and archiving
  Sorting and searching for patterns
  System information (users, processes, time)
  Conditional tests
  Stream Editing
  Finding and comparing files
  Arithmetic and String Manipulation
  Merging files
33.References
  Books
  Online Resources
  Unix-like shells and utilities for Microsoft Windows