LinuxCBT - BASH Edition

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Genre: E-learning

Bourne Again Shell (BASH) Scripting - Module I

Introduction to BASH Command Line Interface (CLI)

Identify BASH installation & key configuration files on RedHat & Debian GNU/Linux distros

.profile/.bash_profile/.bashrc/.bash_history

Identify & use common built-in BASH commands (pwd,cd,set,unset,export,source,etc.)

BASH Command-line Expansion

Brace Expansion

Tilde Expansion

Parameter & variable Expansion

Command Substitution

BASH Reserved words

BASH History identification & configuration

Aliases (ls,du,df,rm,cp)

Backticks - command expansion & execution

BASH Prompt configuration

Command chaining

Error level/Return code (Command Exit Status) identification

Conditional execution of subsequent commands (&&,||)

Redirection | Error Handling

Standard Input

Direct input from STDIN (Standard Input)

Redirect input from a file

Standard Output

Direct output to STDOUT (Standard Output )

Redirect output to a file

Append Standard Output to an existing file

Standard Error

Explore STDERR attributes

Redirect Standard Error

Input/Output (I/O) Redirection

Pipes

Sequential execution via pipes

Quoting & Escaping

BASH Scripting

Basic Script definition (hello world), permissions modification & execution

Internal BASH variables

Global Variable definition

Function definition

Local Variable definition - function scope

BASH Arrays

Loops

Menu creation using Select

Job control - Foreground/Background processing

Conditionals

Case - Concise Conditional Branching

Positional Parameters

BASH Script Definition

Create BASH script to move multiple files to new names defined by positional parameters

Create script to monitor directory for file changes and report the differences via E-mail to Administrator

Create script to monitor directory size and report threshold encroachment to Administrator via E-mail

Define script to parse logs for keywords and notify the Administrator via E-mail

Create script to monitor network connectivity between hosts and report outages to Admin via E-mail

Define script to monitor process, restart if fails, and E-mail Administrator at defineable limits

Create script to backup sub-directories using Tar & Gzip, define threshold, and SSH file to remote host

Log the output of BASH scripts to a Syslog-like format

BASH 3.x Updates

Explore BASH 3.x on multiple platforms: Linux|Solaris|MacOSX|FreeBSD

Compare and contrast to BASH 2.x

Execute BASH 2.x commands|scripts within BASH 3.x on multiple platforms

Evaluate results

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