Working with Variables in PowerShell Core for Linux

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Perform a system update, register the MS RedHat repository, and install PowerShell

1. Use the yum command to sync the package index files from their sources via the Internet:

   sudo yum check-update

2. Use the yum command to install the newest versions of all installed packages on CentOS:

   sudo yum update

3. Register the Microsoft RedHat Repository:

   curl https://packages.microsoft.com/config/rhel/7/prod.repo | sudo tee /etc/yum.repos.d/microsoft.repo

4. Install PowerShell:

   sudo yum install -y powershell

5. Start PowerShell:

   pwsh

Work with Creating, Changing, Using, and Removing Variables

1. Set a variable named MyVar and enter the integers 10, 11, and 12 as values:

   $MyVar = 10, 11, 12

2. Set a variable named Path and enter the path "/home/cloud_user/" as the value:

   $Path = "/home/cloud_user"

3. Set a variable name Process and set the cmdlet Get-Process as the value:

   $Processes = Get-Process

4. Set a variable named Today and set the value as (Get-Date).DateTime as the value:

   $Today = (Get-Date).DateTime

5. Call the variable MyVar and observe the output:

   $MyVar

6. Call the variable Today and observe the output:

   $Today

7. Call the variable Path and observe the output:

   $Path

8. Call the variable Processes and observe the output:

   $Processes

9. Change the value of MyVar to 15,16,17

   $MyVar = 15,16,17

10. Call the variable MyVar and observe the change in the output:

    $MyVar

11. Change the value of MyVar to "The Blue Dog"

    $MyVar = "The Blue Dog"

12. Call the variable MyVar and observe the change in the output:

    $MyVar

13. Clear the variable MyVar using both the Clear-Variable and $null methods":

    Clear-Variable -Name MyVar
    $MyVar = $null

14. Call the variable MyVar and observe the change in the output:

    $MyVar

15. Remove the variable MyVar using the Remove-Variable cmdlet:

    Remove-Variable -Name MyVar

16. Run the cmdlet Get-Variable and verify that MyVar is not in the list of variables:

    Get-Variable

17. Exit PowerShell

    exit