Basic Linux Shell Scripting for DevOps Engineers.

In the world of DevOps, mastering Linux shell scripting is a fundamental skill for any DevOps engineer. Shell scripting allows you to automate repetitive tasks, streamline processes, and enhance productivity.

• Explain in your own words , what is Shell Scripting for DevOps

Shell scripting for DevOps is like creating a set of instructions for your computer to follow automatically. It’s like giving your computer a list of tasks to do without having to do each one by hand. These tasks can include setting up and managing servers, installing software, and making sure everything runs smoothly. It makes the whole faster, more efficient, and less prone to error.

• What is#!/bin/bash?can we write#!/bin/shas well?

  The #!/bin/bash and #!/bin/sh lines are called shebangs and they are used in Unix-like operating systems to specify the interpreter that should be used to execute the script.

  1. #!/bin/bash: This shebang specifies that the script should be interpreted using the Bash shell. Bash (Bourne Again Shell) is a popular and feature-rich shell that is an extension of the original Bourne Shell.

  2. #!/bin/sh: This shebang specifies the generic Bourne Shell as the interpreter. The Bourne Shell is a simpler shell compared to Bash, and it may lack some of the features and enhancements introduced in later shell versions like Bash.

     In simple terms, if you're writing a computer script and want to use features that are unique to Bash, it's common to start the script with #!/bin/bash. But if your script follows the basic rules of the original Bourne Shell and you want it to work on any system, it's better to start it with #!/bin/sh because it makes the script more compatible and can be run on any shell that follows the standard rules.

• Write a Shell Script which printsI will complete #90DaysOofDevOps challenge

  1. You can use any text editor of your choice. For example, you can use nano, vim

     

     

     

     • Write a Shell Script to take user input, input from arguments and print the variables.

       

       Make it executable by running chmod +xuserInput.sh. You can then run the script with ./userInput.sh and provide the value and it will give user value and argument input will be blank.

       

       • Write an Example of If else in Shell Scripting by comparing 2 numbers

         

         the script takes input for two numbers from the user and then uses an if-else statement to compare them. If the numbers are equal, it prints a message indicating equality. If the first number is greater than the second, it prints a message stating so, and if the second number is greater than the first, it prints a message indicating that as well.

         Conclusion

       • Shell Scripting in DevOps is a potent tool for automating tasks, ensuring efficiency, and promoting consistency. The choice between #!/bin/bash and #!/bin/sh depends on system-specific considerations. The showcased scripts for the #90DaysOfDevOps challenge, user input handling, and If-Else conditions demonstrate the flexibility and power of Shell Scripting. As a fundamental skill in the DevOps arsenal, mastering Shell Scripting empowers professionals to create agile and robust automation solutions.