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20 and 22, in particular, should provide some helpful pointers, if you need to refer back to them.
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Remember that you don t need to construct this all at once. Instead, start small, with a command or two that accomplishes the core tasks of retrieving the information you need. Then start to build a structure around those commands that will provide the other capabilities, such as parameters, prompting, help, and so forth.
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There are many ways to accomplish this task in PowerShell, but listing 25.1 shows how I chose to solve this task. Note that I saved this as /Documents/WindowsPowerShell/ Modules/MyModule/MyModule.psm1, and I imported it into the shell by running Import-Module MyModule.
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Listing 25.1 Get-OSInfo and its supporting code, in a script module
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function GetOSInfo { param ( [string]$name, [string]$logfile ) try { $continue = $True $os = Get-WmiObject Win32_OperatingSystem ` -computerName $name -ea 'Stop' } catch { if ($logFile -ne '') { $name | Out-File $logfile -append } $continue = $False } if ($continue) { $bios = Get-WmiObject Win32_BIOS ` -computername $name $obj = New-Object PSObject $obj | Add-Member NoteProperty ComputerName $name $obj | Add-Member NoteProperty OSBuild ($os.buildnumber) $obj | Add-Member NoteProperty BIOSSerial ($bios.serialnumber) $obj | Add-Member NoteProperty LastBoot ` ($os.ConvertToDateTime($os.lastbootuptime)) Write-Output $obj } }
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<# .SYNOPSIS Retrieves key information from the specified computer(s) .DESCRIPTION Get-OSInfo uses WMI to retrieve information from the Win32_OperatingSystem and Win32_BIOS classes. The result is a combined object, included translated date/time information for the computer's most recent restart. .PARAMETER computername The computer name, or names, to query.
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.PARAMETER logFailures Include this parameter to have failed computer names logged to a file. Specify the filename as the value for this parameter. .EXAMPLE Assuming names.txt contains one computer name per line: Get-Content names.txt | Get-OSInfo -log c:\errors.txt .EXAMPLE Assuming the ActiveDirectory module is available, this example retrieves information from all computers in the domain: Get-ADComputer -filter * | Select -expand name | Get-OSInfo .EXAMPLE Just use a single, manually-specified computer: Get-OSInfo -computername SERVER-R2 #> function Get-OSInfo { [CmdletBinding()] param ( [Parameter(Mandatory=$True, ValueFromPipeline=$True, ValueFromPipelineByPropertyName=$True)] [Alias('host')] [string[]]$computerName, [string]$logFile = '' )
BEGIN { if ($logFile -ne '') { Del -Path $logFile -ErrorAction 'SilentlyContinue' } } PROCESS { foreach ($name in $computername) { GetOSInfo $name $logFile } } } New-Alias goi Get-OSInfo
1& 1*
1( 2)
Export-ModuleMember -function Get-OSInfo Export-ModuleMember -alias goi
Here s what s happening, starting at the top of the script:
The GetOSInfo function is doing the real work b. In it, I pass in a single computer name and the log file path c.
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The function sets a $Continue variable d that assumes the first WMI query will work. That query uses an -ErrorAction of Stop e, so that if an error occurs the Catch block will execute. The Catch block logs the computer name to a file if a log file was specified f. It also sets the $Continue variable to $False, so that the second WMI query won t execute g. The second WMI query h executes only if the first one succeeded. With both WMI queries complete, I build a custom output object and attach properties to it i. Notice that the LastBootUpTime property is being converted to a normal DateTime by using the built-in ConvertToDateTime() method that s attached to all WMI objects. Once completed, the custom object is written to the pipeline j. The Get-OSInfo function is the one I want users to actually run, so I provide comment-based help 1). That help includes detailed examples of how to use the function 1!. The function uses cmdlet-style parameters 1@, including several parameter attributes for the -computerName parameter 1#, and the alias that will allow the user to use -host instead of -computerName 1$. The $logFile parameter defaults to an empty string 1%. I used that in the GetOSInfo function to determine whether or not a log path was actually provided. In the BEGIN block, I check to see if a log file path was provided 1^. If one was, I delete any existing file having that name. Because there might not be a file, I specify the -EA SilentlyContinue parameter to suppress any errors from this command. It s possible to provide computer names via the -computerName (or -host) parameter, or via the pipeline. The names will end up in the right variable anyway 1&, so all I need to do is manually enumerate those values and call the GetOSInfo worker function once for each computer name 1*. I define an alias, goi, for the Get-OSInfo function 1(. To hide the GetOSInfo worker function, I manually export both the GetOSInfo function and the goi alias 2). That ensures that only those two items will be visible to someone who imports this module.
To be sure, this is a complex script, but much of the complexity is actually in the structure, not in the commands. The underlying commands that are doing much of the work are fairly straightforward. The structure serves to make this more accessible to less-experienced co-workers and colleagues.
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