Redhat Technologies

Linux Bash Scripting Training

A bash script is defined as “a set of commands written in a plain text file.” While a bash script is more capable than an MS-DOS batch file, it nonetheless performs similar tasks.

Mr. Krishna Jeevan Upadhyay

Linux Bash Scripting Training

Linux Bash Scripting Training | KR Network Cloud

Bash script defined as: “Bash Script is series of command written in plain text file. Bash script is just like batch file is MS-DOS but have more power than the MS-DOS batch file.”

Normally shells are interactive. It means shell accept command from you (via keyboard) and execute them. But if you use command one by one (sequence of ‘n’ number of commands), then you can store this sequence of command to text file and tell the shell to execute this text file instead of entering the commands. This is known as shell script.


Linux Bash Scripting Course Objective

Input file preparation, job monitoring, and output processing can all be done with bash scripts.

  • Useful for creating custom commands.
  • Save lots of time on file processing.
  • To automate a few everyday tasks.
  • The system administration portion is likewise programmable.
  • A working knowledge of bash scripting is essential to everyone wishing to become reasonably adept at system administration, even if they do not anticipate ever having to write a script.
  • Learning to write bash scripts is not difficult because the scripts can be broken up into manageable chunks and there aren’t many bash-specific operators or options to become familiar with.
  • There are just a few “rules” to learn, and the syntax is easy to understand and similar to chaining together and running utilities at the command line.
  • A “quick and messy” way to prototype a sophisticated application is via a bash script.

Course Content

Unit-1 Introduction
  • Bash
  • Types of Unix Bash
  • Advantages of Bash Scripts
Unit-2 Bash Basics
  • Initialization Files
  • Login Shells, Non-Login Shells
  • Aliases, Variables
  • Working with Variables
  • Important Internal Bash Variables
  • Command History
  • Input and Output Channels
  • Redirection to Files
  • The here Operator
  • Feeding Output to Another Process
  • Duplicating the Output with tee
  • Types of Commands
  • Quoting
  • Substitution and Expansion
  • Variable Substitution
  • Filename Expansion(File Globbing)
  • Command & Arithmetic Substitution
  • Command-Line Interpretation
  • Command Separators
Unit-3 Basic Script Elements 1(Input, Output)
  • Program Flow Charts
  • General Considerations
  • Producing Output From a Script
  • Reading User Input
  • Simple Operation with Variables
  • Basic Strings Operation
  • Arithmetic Operations
  • Regular Expressions
Unit-4 Basic Script Elements 2 (Control Structures)
  • Simple Branching With if
  • Short Form of if
  • Multiple Branch with case
  • Iterations and Loops
  • Looping with while and until
  • Processing a List with for
  • Exiting From a Loops
  • Exiting from the Current Loop
  • Iteration with continue
  • Exiting from the Loop with break
Unit-5 Advanced Scripting Techniques
  • Reading input with read
  • Shell Functions
  • Reading Options with getopts
  • Signal Handling with trap
  • Implementing Simple Menus with select
  • Dialog Boxes with dialog
  • Yes/No Box(yesno)
  • Message Box(msgbox)
  • Input Box(input box)
  • Text Box(text box)
  • Menu Box(menu)
  • Check List Box(checklist)
  • Radio List Box(radio list)
  • progress Meter Box(gauge)
Unit-6 Useful utilities for Shell Scripts
  • cat
  • cut
  • date
  • grep
  • egrep
  • fgrep
  • sed
  • test
  • tr
  • awk
  • Sort
  • uniq
  • Special Variable Substitution Operators for Bash
  • Debugging Shell ScriptsSample ScriptsBottom of Form

Why Learn Linux Bash Scripting Training?

What is Shell?

  • It performs commands that are read from files or common input devices like keyboards as an interpreter for command languages.
  • The bash (terminal) launches when you log in or open a console.
  • A quick and messy method of using utilities.

The shell is not part of the system kernel but uses the system kernel to execute programs, create files, etc.

What is Kernel?

  • Kernel is the heart of Linux OS.
  • It manages the resources of Linux OS. Resources means facilities available in Linux. E.g. Facility to store data, print data on a printer, memory, file management, etc.
  • Kernel decides who will use this resource, for how long, and when. It runs your programs (or is set up to execute binary files).
  • The kernel acts as an intermediary between the computer hardware and various programs/applications/shells.

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