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Logic Flow for PowerShell Core in Linux

PowerShell is no different than other computer languages in that more complex capabilities require the addition of logic. For those familiar with logic controls in other programming languages, they'll find no surprises. In this hands-on lab, we cover some of the PowerShell specifics for controlling logic flow, conditional statements, comparison operators, and switches.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 1h 0m
Published
Clock icon Apr 24, 2020

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Table of Contents

  1. Challenge

    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
    
    1. Use the yum command to install the newest versions of all installed packages on CentOS.
    sudo yum update
    
    1. Register the Microsoft RedHat repository.
    curl https://packages.microsoft.com/config/rhel/7/prod.repo | sudo tee /etc/yum.repos.d/microsoft.repo
    
    1. Install PowerShell.
    sudo yum install -y powershell
    
    1. Start PowerShell.
    pwsh
    
  2. Challenge

    Work with PowerShell Conditional Statements

    1. Set variable a equal to 3.
    $a=3
    
    1. Create a new file name script1.ps1 using vi.

    2. Input the following into the script1.ps1 file:

    if ($a -gt 2) {
        Write-Host "The value $a is greater than 2."
    }
    
    1. Save the script1.ps1 file in vi using :wq.

    2. Run the script1.ps1 file.

    ./script1.ps1
    
    1. Set the variable a equal to 1.
    $a=1
    
    1. Run script1.ps1 again.
    ./script1.ps1
    
    1. Create a new script using vi called script2.ps1.

    2. Input the following into the script2.ps1 file:

    if ($a -gt 2) {
        Write-Host "The value $a is greater than 2."
    }
    else {
        Write-Host ("The value $a is less than or equal to 2,")
    }
    
    1. Run the script2.ps1 file.
    ./script2.ps1
    
    1. Change the variable a back to 3.
    $a=3
    
    1. Run the script2.ps1 file again.
    ./script2.ps1
    
  3. Challenge

    Work with PowerShell Switches to Handle Multiple If Statements

    1. Enter the following at the PowerShell prompt:
    switch (3)
    {
        1 {"It is one."}
        2 {"It is two."}
        3 {"It is three."}
        4 {"It is four."}
    }
    
    1. Enter the following at the PowerShell prompt:
    switch (3)
    {
        1 {"It is one."}
        2 {"It is two."}
        3 {"It is three."}
        4 {"It is four."}
        3 {"Three again."}
    }
    
    1. Enter the following at the PowerShell prompt:
    switch (3)
    {
        1 {"It is one."}
        2 {"It is two."}
        3 {"It is three."; Break}
        4 {"It is four."}
        3 {"Three again."}
    }
    
    1. Enter the following at the PowerShell prompt:
    switch (4, 2)
    {
        1 {"It is one." }
        2 {"It is two." }
        3 {"It is three." }
        4 {"It is four." }
        3 {"Three again."}
    }
    
    1. Enter the following at the PowerShell prompt:
    switch (4, 2)
    {
        1 {"It is one."; Break}
        2 {"It is two." ; Break }
        3 {"It is three." ; Break }
        4 {"It is four." ; Break }
        3 {"Three again."}
    }
    
    1. Exit PowerShell.
    exit
    

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