Returning multiple values from simular hash keys powershell - powershell

Question

I have the following code that pulls in some server information from a text file and spits it into a hashtable.
Get-Content $serverfile | Foreach-Object {
if($_ -match '^([^\W+]+)\s+([^\.+]+)')
{
$sh[$matches[1]] = $matches[2]
}
}
$sh.GetEnumerator()| sort -Property Name
This produces the following:
Name Value
---- -----
Disk0 40
Disk1 40
Disk2 38
Disk3 43
Memory 4096
Name Value
Number_of_disks 1
Number_of_network_cards 2
Number_of_processors 1
ServerName WIN02
Depending on the server there may be one Disk0 or many more.
My challenge here is to pull each Disk* value from each of the varying number of Disk keys and return the values in a comma separated list, for example;
$disks = 40,40,38,43
I have tried varying approaches to this problem however none have met the criteria of being dynamic and including the ',' after each disk.
Any help would be appreciated.

Answer 1

I assume that when you say "Depending on the server there may be one Disk0 or many more", you mean "one Disk or many more", each with a different number? You can't have more than one Disk0, because key names can't be duplicated in a hash.
This will give you a list of all the hash values for keys starting with "Disk":
$sh.Keys | ?{$_ -match '^Disk'} | %{$sh.$_}
If you actually want to get a comma-separated list (a single string value), you can use the -join operator:
$disks = ($sh.Keys | ?{$_ -match '^Disk'} | %{$sh.$_}) -join ','
However, if the reason you want a comma-separated list is in order to get an array of the values, you don't really need the comma-separated list; just assign the results (which are already an array) to the variable:
$disks = $sh.Keys | ?{$_ -match '^Disk'} | %{$sh.$_}
Note, BTW, that hashes are not ordered. There's no guarantee that the order of the keys listed will be the same as the order in which you added them or in ascending alphanumeric order. So, in the above example, your result could be 38,40,43,40. If order does matter (i.e. you're counting on the values in $disks to be in the order of their respective Disk numbers, you have two options.
Filter the listing of the keys through Sort-Object:
$sh.Keys | ?{$_ -match '^Disk'} | sort | %{$sh.$_}
(You can put the | sort between $sh.Keys and | ?{..., but it's more efficient this way...which makes little difference here but would matter with larger data sets.)
Use an ordered dictionary, which functions pretty much the same as a hash, but maintains the keys in the order added:
$sh = New-Object System.Collections.Specialized.OrderedDictionary