To determine the version of PowerShell installed on a computer and check if it is installed, you can use the following methods:

Checking for PowerShell Installation:

1. Check for Existence in Command Prompt: Open a command prompt and type the following command:

powershell -v

If PowerShell is installed, this command will display the version number. If it’s not installed, you might see an error or a message indicating that ‘powershell’ is not recognized as a command.

1. Check for Existence in PowerShell: Open a PowerShell session and type:

$PSVersionTable.PSVersion

This will display detailed information about the PowerShell version.

Determine PowerShell Version:

1. Using $PSVersionTable: Open a PowerShell session and type:

$PSVersionTable.PSVersion

This will display the major, minor, build, and revision numbers of the installed PowerShell version.

1. Using Get-Host: You can also use the Get-Host cmdlet:

Get-Host

This will display information about the host environment, including the PowerShell version.

1. Checking the Registry: PowerShell version information is also stored in the Windows Registry. You can check the registry key:

Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\PowerShell\1\PowerShellEngine' -Name PowerShellVersion

This will provide the version information.

Checking for PowerShell Core (pwsh):

If you are using PowerShell Core (pwsh), you can determine its version with the following command:

$PSVersionTable.PSVersion

or

Get-Host

These commands will provide information about the PowerShell Core version installed.

Choose the method that best fits your preference and the information you need.