UNIX Basics and Shell Scripting

UNIX is a multitasking, multi-user computer operating system that exists in many variants. UNIX is the oldest and most secure operating system architecture present today. Linux/Unix is still used today in a lot of servers. Almost 80% of the websites are running on UNIX servers.

Shell Scripting Introduction

Unix uses shells to accept commands given by the user, there are quite a few different shells available. The most commonly used shells are SH(Bourne SHell) CSH(C SHell) and KSH(Korn SHell), most of the other shells you encounter will be variants of these shells and will share the same syntax, KSH is based on SH and so is BASH(Bourne again shell). TCSH(Extended C SHell) is based on CSH.

The various shells all have built in functions which allow for the creation of shell scripts, that is, the stringing together of shell commands and constructs to automate what can be automated in order to make life easier for the user.

Module-1

Understand the architecture of UNIX.

Understanding the basics of UNIX

File Systems for synchronize storage of files

Details explanation of file attributes

Basic commands and concepts

Command Manuals

Relative and Absolute Paths

Environment variables

Understand parent-child relationship of process and jobs

Basic of editor: vi

Module 1 Assignments

Module 2

Shell Introduction

Advantages of the Shell

Executing shell commands

Different types of shell

What is shell Scripting?

Writing basics shell scripts

Interpolation, Types of variables, Operators, read variables, exit status etc

Common commands used in shell script: substitution, quoting,  flow controls, parameters, Shell initialization files,  Quoting characters, Shell expansion,  Aliases

Shell scripting execution

 Module 2 Assignments

Module-3

Special Variables and Parameters

Function Introduction

Understand how functions use as independent building blocks

Scope of variable in functions – local & global

Input/output redirection

Variables substitution in shell

Connect to third party application like: Oracle, FTP etc.

HERE documents

Regular Expressions in detail (use grep, awk, sed)

Industry experience sample scripts debugging

Standard process of writing shell scripts as per company standards.

Module 3 Assignments

Module-4

Important commands and utilities like cut, sort, uniq, grep, find, awk, sed etc

nohup and backend processes

Signals handling and trapping

SED Utility in detail

GREP Utility in detail

FIND Utility in detail

AWK utility in detail

Famous and often use cases with one liner examples

Module 4 Assignments

Module-5

Assigning values to positional parameters

Compress and archive the files

Debug your shell Scripts

Crontab and at utilities for job scheduling

Job scheduling third party tools discussion