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If you are used to run Linux commands, most probably it is on Bash Shell. Bash shell scripting is a scripting language that is used to run multiple commands and process inputs/outputs through variables, regular expressions, controls, conditions, loops and functions. Linux operating system has lots of system programs written in bash.

What I am going to learn throughout this course?

In this course, you will learn following important concepts and hands on stuff:

• • Run different commands through bash script

  • Use loops, controls, variables, and functions with different commands

  • Parse files using bash script

  • Process system resources using bash script

  • Set bash scripts to run as a daemon and trigger when some event occurs

Please check the curriculum for more information..

Who Should Join this program & What Are the Pre-Requirements:

Software Testers (QA), Business Analysts, Programmers, Project Leads, Managers and anyone who is working in linux environment and wants to automate commands using bash bash scripting.

Needs prior knowledge about Linux commands. You may look “Linux Operating System and Commands” from our portal.

Outline

• 1. Introduction to Shell Scripting

     1. Linux Operating System and Kernel

     2. Linux Shells and Bash Shell Scripting

     3. Writing and running Shell scripts

     4. Echo Command

     5. Adding Single & Multi Line comments

     6. Shell Variables

     7. Quotes - Single, double, escape character

     8. Read Statement

     9. Arithmetic Operations

     10. Customizing Bash Shell Environment

     11. Exit Status

  2. Commands, Logical Operators and Conditional Expression

• • 1. Test command for condition

    2. logical && and || linked with exit status

    3. Logical not !

    4. Conditional expressions

    5. String comparison

    6. File attributes

• 3. Regular Expression and Expansions

• • 1. Regular Expression (RegEx) is a key for bash

    2. RegEx samples

    3. Expansions and Parameters

    4. Expansion Order

    5. Examples:

    6. Wrong and Write way of expansions

    7. Parameter Expansion

    8. Using tr, awk, sed and shopt command for substitution

• 4. Exit and exit status

  5. Decision Making

• • 1. If condition with test

    2. if...else...fi

    3. Nested ifs

    4. Multilevel if-then-else

    5. Switch case

• 6. Loops and Controls

• • 1. For loop with item list, expression,

    2. While loop

    3. While loop with decisions and expressions

    4. Until loop

    5. Until loop vs while loop

    6. break, continue and exit

    7. Using Selection for Menu work

    8. Select Script to change file permission

• 7. Command Arguments

  8. Shell I/O Redirection

• • 1. input(0)

    2. output(1)

    3. error(2)

    4. Here document

    5. Discard outputs

• 9. Functions

• • 1. Using blocks

    2. Defining functions

    3. Calling functions

    4. Passing arguments

    5. Global and Local variables

• 10. Tips of shell scripting for Linux admins

• • 1. Drawing special pattern

    2. Creating colorful output

    3. Encrypt a file directory

    4. Check server utilization

    5. Check disc space and send email alert

• 11. Tips and tricks to improve performance of shell scripting

• • 1. Better file handling

    2. Use only necessary commands inside a loop

    3. Use commands with possible options

    4. Use internal commands than external if possible

    5. Avoid useless use on commands

    6. Minimize using ls for file listing

    7. Use sed/awk properly

• 12. Bash Shell Scripts for Functional Testing

On Demand:

Bash Shell Scripts for Functional Testing

These basic steps and recommendations can be applied to many client/server applications that run in Linux.

• 1. Document the prerequisites and main sequence for running scripts

  2. Divide actions into logical groups

  3. Develop an execution sequence based on a common usage scenario

  4. Provide comments and instructions in each shell script

  5. Make an initial backup to create a baseline

  6. Check for input parameters and environment variables

  7. Try to provide "usage" feedback

  8. Try to provide a "silent" running mode

  9. Provide one function to terminate the script when there are errors

  10. When possible, provide functions that do a single task well

  11. Capture the output of each script, while watching the output being produced

  12. Inside each script, capture the return code of each line command

  13. Keep a count of the failed transactions

  14. Highlight the error messages for easy identification in the output file

  15. When possible, generate files "on the fly"

  16. Provide feedback on the progress of the execution of the script

  17. Provide a summary of the execution of the script

  18. Try to provide an output file that is easy to interpret

  19. When possible, provide cleanup scripts and a way to return to the baseline

Assessment:

Scenario 1: Write a bash script to print name of each user from /etc/passwd.

Scenario 2: Write a bash script that counts vowels, blank space, “an”, “a”, characters, numbers of lien and symbol for a given file.

Scenario 3: Write a bash script that reads a file and prints even and odd numbered lines to separate files.

Scenario 4: Write a script to monitor Linux Server disk space using while loop and email alert when used space .+ 90%.

Scenario 5: Write a script that Parses two directories and deletes similar files from first directory.

Scenario 6: Write a script to sum an input number’s digit