gistfile1.txt

#requires -Modules PSReleaseTools

<#
.SYNOPSIS
    Compares local PowerShell version to Github latest release, installs using installpkg
#>
function Install-PowerShellonMac {
    [CmdletBinding()]

    param(
    )

    begin 
    {
        if ($IsOSX -eq $False)
        {
            Write-Error -Message 'This function only runs on OS X'
            break
        }
    }      
    process 
    {
        # Compare local PS and latest release
        $CompareVersion = Get-PSReleaseCurrent | Where-Object {$_.Version -ne $_.LocalVersion} | Select-Object Version,LocalVersion
        # If local version different than latest prompt user to install
        if ($CompareVersion)
        {
            Write-Output "$CompareVersion"
            Read-Host "Press Enter to install latest PowerShell release or CTL + C to exit"

            ##Download PS and install using installpkg
            $FileName = Get-PSReleaseAsset -Family MacOS | Select-Object FileName -ExpandProperty FileName
            Get-PSReleaseAsset -Family MacOS | Save-PSReleaseAsset
            sudo installpkg $FileName
        }   
        # If local PS and latest release are same break
        elseif (!$CompareVersion)
        {
            Write-Output 'Your local version is the same as latest release'
            break
        }
    }
}