Shell Script

In the course LLC108, the participants gain a basic to mid level understanding of the techniques of writing a shell script. They learn to create scripts to automate administrative tasks by understanding the structure of standard examples in shell scripting.

Modules

• Introduction

  • Shells
  • Types of Unix Shells
  • Advantages of Shell Scripts

• Basics of the Bash Shell

  • Initialization Files
  • Login Shells, Non-Login Shells
  • Aliases, Variables
  • Working with Variables
  • Important Internal Bash Variables
  • Command History
  • Input and Output Channels
  • Redirection to Files
  • The here Operator
  • Feeding Output to Another Process
  • Duplicating the Output with tee
  • Types of Commands
  • Quoting
  • Substitution and Expansion
  • Variable Substitution
  • Filename Expansion(File Globbing)
  • Command & Arithmetic Substitution
  • Command-Line Interpretation
  • Command Separators

• Basic Script Elements (Input, Output)

  • Program Flow Charts
  • General Considerations
  • Producing Output From a Script
  • Reading User Input
  • Simple Operation with Variables
  • Basic Strings Operation
  • Arithmetic Operations
  • Regular Expressions

• Basic Script Elements (Control Structures)

  • Simple Branching With if
  • Short Form of if
  • Multiple Branch with case
  • Iterations and Loops<
  • Looping with while and until
  • Processing a List with for
  • Exiting From a Loops
  • Exiting from the Current Loop
  • Iteration with continue
  • Exiting from the Loop with break

• Advanced Scripting Techniques

  • Reading input with read
  • Shell Functions
  • Reading Options with getopts
  • Signal Handling with trap
  • Implementing Simple Menus with select
  • Dialog Boxes with dialog
  • Yes/No Box(yesno)
  • Message Box(msgbox)
  • Input Box(input box)
  • Text Box(text box)
  • Menu Box(menu)
  • Check List Box(checklist)
  • Radio List Box(radiolist)
  • progress Meter Box(gauge)