Chapters/analyzing-your-script/Script.ps1
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Function Get-TMComputerStatus { [cmdletbinding()] Param( [Parameter(ValueFromPipeline, Mandatory)] [ValidateNotNullorEmpty()] [Alias("CN", "Machine", "Name")] [string[]]$Computername, [string]$ErrorLog, [switch]$ErrorAppend ) BEGIN { Write-Verbose "Starting $($myinvocation.mycommand)" } PROCESS { foreach ($computer in $Computername) { Write-Verbose "Querying $($computer.toUpper())" Try { $params = @{ Classname = "Win32_OperatingSystem" Computername = $computer ErrorAction = "Stop" } $OS = Get-CimInstance @params $params.ClassName = "Win32_Processor" $cpu = Get-CimInstance @params $params.className = "Win32_logicalDisk" $vol = Get-CimInstance @params -filter "DeviceID='c:'" $OK = $True } Catch { $OK = $False $msg = "Failed to get system information from $computer. $($_.Exception.Message)" Write-Warning $msg if ($ErrorLog) { Write-Verbose "Logging errors to $ErrorLog. Append = $ErrorAppend" "[$(Get-Date)] $msg" | Out-File -FilePath $ErrorLog -Append:$ErrorAppend } } if ($OK) { #only continue if successful $obj = [pscustomobject]@{ Computername = $os.CSName TotalMem = $os.TotalVisibleMemorySize FreeMem = $os.FreePhysicalMemory Processes = $os.NumberOfProcesses PctFreeMem = ($os.FreePhysicalMemory/$os.TotalVisibleMemorySize)*100 Uptime = (Get-Date) - $os.lastBootUpTime CPULoad = $cpu.LoadPercentage PctFreeC = ($vol.FreeSpace/$vol.size)*100 } # create a default display property set [string[]]$props = 'ComputerName','Uptime','PctFreeMem','PctFreeC' $ddps = New-Object -TypeName System.Management.Automation.PSPropertySet DefaultDisplayPropertySet, $props $pssm = [System.Management.Automation.PSMemberInfo[]]$ddps $obj | Add-Member -MemberType MemberSet -Name PSStandardMembers -Value $pssm #add a property set $obj | Add-Member -MemberType PropertySet -Name Mem -Value 'Computername','TotalMem','FreeMem','PctFreeMem' #adding an alias $obj | Add-Member -MemberType AliasProperty -Name Memory -Value TotalMem $obj } #if OK } #foreach $computer } END { Write-Verbose "Starting $($myinvocation.mycommand)" } } #Get-TMComputerStatus |