Linux Shell Programming

Linux Shell Programming

Linux development skills
The development of new Shell scripts and the maintenance of existing ones, in a manner that offers easy understanding to others, is fundamental to a successful Linux installation. These Shell scripts can then be used to automate tasks and functions either independently or interactively.
Course Objectives
To give delegates a good working knowledge of how to manipulate the shell as an environment interface and how to fully utilise the shell programming language.
Skills Gained
Use the various shell quoting mechanisms appropriately.
Write simple scripts to enhance basic command output.
Manipulate shell variables and user-defined variables in scripts.
Implement conditional execution facilities.
Use the shell’s built-in loop constructs where appropriate.
Write scripts to trap user interrupts.
Develop menu-driven shellscripts.

On completion of the course the delegate will have a good working knowledge of how to manipulate the Shell as an environment interface and how to fully utilise the Shell programming language.

Topics Covered:

Shell Environment
Customisation of the Environment
Shell Program Structure
Shell Program Execution
Shell Variables
Positional Parameters
Special Shell Variables
Shell Programming Statements
Conditional Statements
Looping Constructs
Interrupt Handling
Debugging Tools


Pre-Requisite Courses:

Linux Introduction

The shell acts as an intermediary between the user and the operating system, and acts a a command interpreter, interpreting what you type at the command line into a form the operating system can understand. The default command line interpreter for Linux is BASH.
Shell programming is very powerful feature in Linux and complete programs can be written using shell command procedures. Shell scripts are widely used by the operating system and can also greatly simplify the job of the system administrator.

This training course is intended for existing Linux users who wish to learn how to create and use shell scripts to maximum advantage.

Course Content
Course Content London UK
USEFUL TOOLS

A Stream Editor - sed
Sort Lines of Text Files - sort
Remove Sections from each Line of a File - cut
Join Lines on a Common Field - join
Number Lines and Write Files - nl
Write Files in Octal or Other Formats - od
Merge Lines of Files - paste
Split a File into Fixed Sized Pieces - split
Output the Last Part of Files - tail
Print Byte, Word and Line Counts - wc
Exercise

USING STREAMS, PIPES AND REDIRECTS

Redirection
Pipelines
Build and Execute Command Files from Standard Input - xargs
Redirect Output to Multiple Files - tee
Exercise

WRITING SHELL SCRIPTS

Introduction
Starting Out
String Variables
Numeric Variables
Parameters
The Test Command
Language Constructs
Debugging a Shell Script

USING SHELL SCRIPTS

Introduction
Startup Scripts
Automating Regular Tasks
Real-World Examples
Exercise

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