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Shell Scripting Online Training Course Content

UNIX and Linux Basics

• UNIX Operating System
• UNIX evolution
• UNIX and Linux influencers
• flavors of UNIX
• Why UNIX?
• UNIX and Linux features

UNIX shell basics

• Shell hierarchy
• Types of Shells
• Know about Shell
• Login Shell
• Why Use Shell Script?

Shell commands

• Variables and strings
• Math in Shell
• Shell commands

Customizing Environment

• How to Setup Environment?
• Environment variables
• The history command options
• Shortcuts : Defining alias
• Utility scripting
• Scoping with export

Shell Programming

• Program structure
• Shell variables
• Quotes – Strings
• Shell Output
• Print formatted data
• Continuing Lines
• Exit Status
• Logic using test
• Expressions

Script Controls

• Shell script if control
• Switching with case
• while: Looping
• for: Looping with a List
• break and continue in loops
• trap: Interrupting a program
• Debugging Shell Scripts
• Exercise

Shell functions

• Function
• Shell and sub-shell
• Array in shell
• File system
• What’s in a (File) name?
• The Parent-Child Relationship
• The HOME Variable: The Home Directory
• Current Directory
• cd: Changing the Current Directory
• mkdir: Making Directories
• rmdir: Removing Directories
• Absolute Pathnames
• Relative Pathnames
• ls: Listing Directory Contents
• The cat options
• Compare files
• Compress files

The UNIX File System

• Security
• File permissions
• Ownership and permissions
• Common permission with umask
• Groups and users
• Switch user
• Symlink, hard links

Regular Expressions

• Regular Expression Overview
• RE Character Classes
• RE Quantifiers
• RE Parenthesis
• RE Examples with grep
• Re in awk
• RE in sed

System Resources

• Disk size df
• Diskspace utilization du
• RAM space with top
• Swap space free
• CPU uptime

Network

• telnet and ftp
• Communication check : finger
• Remote files : scp, rcp, rsync
• Download from command wget
• Upload from command curl
• Email alerts
• Remote script : ssh
• Password less connectivity

INTRODUCTION TO awk

• Introduction and command line syntax
• The awk program structure
• Operators
• Simple patterns
• Extended patterns
• Special patterns (BEGIN and END)
• Program variables: Built-in variables, User defined variables,Arrays
• Mathematical operators
• Displaying output with print and printf
• Exercises: Create awk scripts to extract selected data from a file and generate reports

awk PROGRAM CONTROL STRUCTURES

• Program control structures
• The if construct
• The while and do … while constructs
• The basic for construct
• Associative array handling
• Functions: Mathematical and string functions, The system function, The getline function, User defined functions
• Exercises: Create an awk script using an program control structures and arrays

awk DEBUGGING AWK SCRIPTS

• Responding to Syntax errors
• Responding to Logical errors
• Exercises: Using tools within a shell script