Shell Programming

This lesson provides an overview of the course contents, the course schedule, the classroom environment and the technical environment.

Lesson Topics:

• Course goals

• Your learning centre

• Course agenda

• Your practice environment

• Introductions

• Practice:

• Getting Familiar with Your Practice Environment

This lesson provides an overview of the various shell environments that are available to UNIX based operating systems.

Lesson Topics:

• Describe the role of a shell in the UNIX environment

• Practice:

• Describe the various UNIX shells

• Reviewing UNIX Shells

This lesson describes the structure and purpose of a shell script.

Lesson Topics:

• Describe the structure of a shell script

• Practice:

• Create a simple shell script

• Reviewing Shell Scripts

• Implement the various debugging options in a shell script

• Writing and Debugging Shell Scripts

This lesson describes the process behind initialising the shell environment.

Lesson Topics:

• Explain the role of startup scripts in initializing the shell environment

• Practice:

• Describe the various types of shell variables

• Using the Shell and Environment Variables

• Explain command-line parsing in a shell environment

• Configuring User Profiles

This lesson explains the technique of pattern matching through the use of regular expressions.

Lesson Topics:

• Find patterns in a file by using the grep command

• Practice:

• Explain the role of regular expressions in pattern matching

• Using Regular Expressions and the grep Command

This lesson describes the features and usage of the sed editor.

Lesson Topics:

• Describe the sed editor

• Practice:

• Perform noninteractive editing tasks by using the sed editor

• Using the sed Editor

This lesson describes the capabilities and usage of the nawk programming language.

Lesson Topics:

• Describe the capabilities of the nawk programming language

• Practice:

• Display output by using the print statement

• Using nawk and Regular Expressions

• Perform pattern matching by using regular expressions

• Using nawk to Create a Report

• Use the nawk built-in and user-defined variables

This lesson describes the techniques and tools used for creating interactive scripts.

Lesson Topics:

• Display output by using the print statement

• Practice:

• Accept user input by using the read statement

• Writing a ZFS File System Backup Script

• Describe the role of file descriptors in file input/output redirection

• Modifying the adduser Script to Prompt for User Information

This lesson describes how to implement variables within a script.

Lesson Topics:

• Describe the various types of scripting variables

• Practice:

• Define positional parameters for accepting user input

• Advanced Variables, Parameters, and Argument Lists

This lesson describes how to implement conditional control into a shell script.

Lesson Topics:

• Describe the various forms of if statements and their role in testing conditions

• Practice:

• Explain the use of if statements through examples

• Using Conditionals

• Describe the role of the case statement in choosing from alternatives

• Modifying the adduser Script by Using Conditionals

This lesson describes how to implement loop controls in a shell script.

Lesson Topics:

• Describe the for, while, and until looping constructs

• Practice:

• Create menus by using the select looping statement

• Using for Loops

• Provide a variable number of arguments to the script by using the shift statement

• Using Loops and Menus

• Parse script options by using the getopts statement

This lesson describes how to create used defined functions in a shell script.

Lesson Topics:

• Create user-defined functions in a shell script

• Practice:

• Use the typeset and unset statements in a function

• Using Functions

• Autoload a function file into a shell script

This lesson describes the role of shell signals.

Lesson Topics:

• Describe the role of shell signals in interprocess communication

• Practice:

• Catch signals and user errors with the trap statement

• Using Traps