# Day4: Basic Linux Shell Scripting for DevOps Engineers.

Day4: 90 days of DevOps -

1. What is Shell Scripting?
    
    Shell scripting is a computer program or a file which have commands in sequential order in order to execute particular tasks.
    
    The script is interpreted by a shell which can be a bash, zsh, sh, or Korn shell. A shell is a command line interpreter which is an interface to provide interaction between the user and the kernel.
    
2. What is `#!/bin/bash?` can we write `#!/bin/sh` as well?
    
    #!/bin/bash is also known as shebang. It is written in order to understand by the command line interpreter that the given script is set for bash.
    
    While we can write #!/bin/sh as well, and bash(bourne again shell) is sh just with better syntax and more features.
    
3. Write a Shell Script that prints `I will complete #90DaysofDevOps challenge.`
    
    #!/bin/bash
    
    echo I will complete the #90DaysofDevOps challenge.
    
4. Write a Shell Script to take user input, input from arguments, and print the variables.
    
    #!/bin/bash
    
    echo What is your name?
    
    read name
    
    echo My name is $name.
    
5. Write an example of If else in Shell Scripting by comparing 2 numbers.
    
    ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1689678519115/9e30e8c8-b287-4056-bd51-2b69be43f83a.png align="center")