PSGames-201601

PSGames-201601.ps1

function Get-Uptime {
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline = $true,
                   ValueFromPipelineByPropertyName = $true)]
        [string[]]$ComputerName = $env:COMPUTERNAME
    )

    BEGIN {
        # Define $Results array to append each computer into; get the current date once
        $Results = @()
        $Now = Get-Date
    }

    PROCESS {
        ForEach ($Computer in $ComputerName) {
            # Reset $WMISuccess to default true for each new $Computer
            $WMISuccess = $true
            Write-Verbose "Testing connection to $Computer"
            If (Test-Connection -ComputerName $Computer -Quiet -Count 1) {
                # Try to query the computer via WMI for info
                Write-Verbose "Retrieving WMI info from $Computer"
                Try {$WMIOS = Get-WmiObject -Class Win32_OperatingSystem -ComputerName $Computer -ErrorAction Stop}
                Catch {$WMISuccess = $false}
                # If WMI query was successful:
                If ($WMISuccess -eq $true) {
                    # Take LastBootUpTime, use WMI's built-in convert to Posh DateTime object,
                        # and then use the .NET method to convert to sortable ('s') ISO 8601 format
                    $StartTime = ($WMIOS.ConvertToDateTime($WMIOS.LastBootUpTime)).GetDateTimeFormats('s')
                    # Subtract the boot time from now to get the running uptime
                    $Uptime = $Now - ($WMIOS.ConvertToDateTime($WMIOS.LastBootUpTime))
                    # Select the TotalDays property and round it to one decimal place
                    $UptimeDays = '{0:N1}' -f $Uptime.TotalDays
                    # Set $MightNeedPatched according to $UptimeDays result
                    If ($UptimeDays -ge 30) {$MightNeedPatched = $true}
                    Else {$MightNeedPatched = $false}
                    # Create an ordered hashtable of values
                    $Properties = [ordered]@{'ComputerName'     = "$Computer"
                                             'StartTime'        = "$StartTime"
                                             'Uptime (Days)'    = [decimal]$UptimeDays
                                             'Status'           = 'OK'
                                             'MightNeedPatched' = $MightNeedPatched
                                            }
                } Else {
                    # Create an ordered hashtable to note our WMI error
                    $Properties = [ordered]@{'ComputerName' = "$Computer"
                                             'Status'       = 'ERROR'
                                            }
                }
                # Append the $Properties hashtable into $Results as an additional object
                $Results += New-Object -TypeName PSObject -Property $Properties
            } Else {
                # No response from Test-Connection; mark as offline
                # Create new object w/ hashtable as above
                $Properties = [ordered]@{'ComputerName' = "$Computer"
                                         'Status'       = 'OFFLINE'
                                        }
                $Results += New-Object -TypeName PSObject -Property $Properties
            }
        }
    }

    END {
        Write-Output $Results
    }
}