Powershell function example.

Get-SystemInfo.ps1

Function Get-SystemInfo {
<#
.SYNOPSIS
Retrieves key system version and model information from one to ten computers.

.DESCRIPTION
Get-SystemInfo uses Windows Management Instrumentation (WMI) to retrieve information from one or more computers.
Specify computers by name or by IP address.

.INPUTS
System.String

.OUTPUTS
System.Management.Automation.PSCustomObject

.PARAMETER computername
One or more computer names or IP addresses, up to maximum of 10.

.PARAMETER LogErrors
Specify this switch to create a text log file of computers that could not be queried.

.PARAMETER ErrorLog
When used with -LogErrors, specifies the file path and name to wich failed computer names will be written. Defaults to c:\Retry.txt

.EXAMPLE
Get-Content names.txt | Get-SystemInfo

.EXAMPLE
Get-SystemInfo -ComputerName SRV-1,SRV-2

#>

    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$True,
                   ValueFromPipeline=$True,
                   HelpMessage="Computer name or IP address")]
        [Alias('hostname')]
        #Validate number of computers
        [ValidateCount(1,10)]
        [string[]]$ComputerName,

        [string]$Errorlog = 'C:\Users\Public\retry.txt',

        [switch]$LogError
    )
    BEGIN{
        Write-Verbose "Error log will be $ErrorrLog."
     }
    PROCESS{
        foreach($computer in $ComputerName){
            Write-Verbose "Querying $computer."

            try{

                $everything_ok = $True
                $os = Get-WmiObject -Class Win32_OperatingSystem -ComputerName $computer -ErrorAction Stop
                Write-Debug "WMI Query"

            }catch{
                $everything_ok = $false
                Write-Warning "$computer failed - $_.Exception.Message"

                if($LogError){
                   "$computer : $_.Exception.Message" | Out-File $Errorlog -Append
                   Write-Warning "Logged to $Errorlog"
                
                }

            }

            If ($everything_ok){
                
                $comp = Get-WmiObject -Class Win32_ComputerSystem -ComputerName $computer
                $bios = Get-WmiObject -Class Win32_Bios -ComputerName $computer
                $props = @{ 'computerName' = $computer;
                        'OSVersion' = $os.version;
                        'SPVersion' = $os.servicepackmajorversion;
                        'BIOSSerial' = $bios.serialnumber;
                        'Manufacturer' = $comp.manufacturer;
                        'Model' = $comp.model }
            
                Write-Verbose "WMI queries complete."

                $obj = New-Object -TypeName PSObject -Property $props
                $obj.PSObject.TypeNames.Insert(0,'MOL.SystemInfo')
            
                Write-Output $obj
            }
         }
    }
    END{}
}


Get-SystemInfo -hostname localhost | Get-Member