Logic Flow for PowerShell Core in Linux

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

1. Set variable a equal to 3.

$a=3

2. Create a new file name script1.ps1 using vi.

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

if ($a -gt 2) {
    Write-Host "The value $a is greater than 2."
}

4. Save the script1.ps1 file in vi using :wq.

5. Run the script1.ps1 file.

./script1.ps1

6. Set the variable a equal to 1.

$a=1

7. Run script1.ps1 again.

./script1.ps1

8. Create a new script using vi called script2.ps1.

9. 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,")
}

10. Run the script2.ps1 file.

./script2.ps1

11. Change the variable a back to 3.

$a=3

12. Run the script2.ps1 file again.

./script2.ps1

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."}
}

2. 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."}
}

3. 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."}
}

4. 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."}
}

5. 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."}
}

6. Exit PowerShell.

exit