Output just property from objects

by rambog at 2012-09-02 11:49:57

For now, I am trying to get simply the domain name into a variable as follows:

PS C:\Users\rambog> $dom=get-wmiobject -class Win32_ComputerSystem | Select D
omain | Out-Host


As you can see, it puts it with a "Domain" colum. I simply want $dom to equal mydomain-corp.local How can I re-do the script (preferably in one line) so it gets what I am looking for. For me this comes up quite a bit as I usually want just one of the properties of an object. If you can also recommend more reading on this subject, it would be further appreciated.
by poshoholic at 2012-09-02 14:08:56
You’re on the right track. Instead of "Select Domain", try this approach:

$dom = Get-WmiObject -Class Win32_ComputerSystem | Select-Object -ExpandProperty Domain
Here’s another alternative:

$dom = (Get-WmiObject -Class Win32_ComputerSystem).Domain
by RichardSiddaway at 2012-09-03 04:21:30
Hi rambog

Don’t be tempted to use the -property parameter on get-wmiobject for this as it just creates an object with a reduced property set.

just to add to Kirk’s answer you don’t need out-host at the end of your pipeline. PowerShell will effectively do that for you.
by rambog at 2012-09-03 09:53:47
I got it to work but Kirk’s way is much better. Here is what I was able to cobble together (not that I really understand what is going on),
$Dom=get-wmiobject -class Win32_ComputerSystem -Computer $CName | Select -Property Domain| %{$.Domain}
Note: the $CName changes as this statement is nested in a foreach loop.
Thank you Kirk and Richard. Richard, I am constantly hitting up against objects when I try to work with Powershell when I expect single values. Your point about the -property parameter still creating an object instead of a single value is something for me to keep in mind.
by RichardSiddaway at 2012-09-03 10:20:54
What you are doing is returning the WMI object for Win32_ComputerSystem; piping that to select to pick off the Domain property and then using foreach-object to get the value of the domain property. % is an alias of foreach-object and I would strongly recommend against using it in scripts

You could get the same answer like this

$dom = get-wmiobject -class Win32_ComputerSystem | %{$

but the best way as Kirk stated is to do this

$Dom=get-wmiobject -class Win32_ComputerSystem | Select -ExpandProperty Domain

Its the approach I would recommend - its less typing and more obvious when you come back to the script in a few months
by rambog at 2012-09-06 05:53:54
I am now working on another script. I am having trouble understanding why the lessons you gave do not apply in the scenario below.
Aside for the fact that I have quite a bit of work to do in order to gather the samAccountName of the user profiles that have been touched in the last 30 days on each computer account, I was simply trying to display the computer being queried along with the profile information. It does not like my line that defines the variable $CName. I thought I was working on the object, $Obj, and that the line beginning with $CName would extract the computer name from the object like the solution in my earlier program. $Obj is some form of DirectorySearcher object and it seems these rules don’t help out. I have tried to transform it in other programs by doing something like $Computer=$Obj.Properties and then attempt to extract the name from $Computer- this time it doesn’t seem to work. Any help would again be appreciated.

$ObjFilter = "(objectClass=Computer)"
$objSearch = New-Object System.DirectoryServices.DirectorySearcher
$objSearch.PageSize = 20000
$objSearch.Filter = $ObjFilter
$objSearch.SearchRoot = "LDAP://OU=NLH,OU=Workstations,DC=labdomain,DC=org"
$AllObj = $objSearch.FindAll()
foreach ($Obj in $AllObj)
$regkey=$remotekey.OpenSubKey("Software\Microsoft\Windows NT\CurrentVersion\ProfileList")
#$profileList = ‘HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList’
$CName=get-wmiobject -class Win32_ComputerSystem -Computer $CName | Select-Object -ExpandProperty Name
Write-Host "Computer Name:`t$CName"
#Get-WmiObject win32_userprofile -Computer $CName |select @{LABEL="last used";EXPRESSION={$.ConvertToDateTime($.lastusetime)}},LocalPath, SID | ft -a |Out-Host
Get-childItem ‘HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList’ | % {Get-ItemProperty $_.pspath } | Select profileImagePath, sid |Out-Host