hashtable filter / select - powershell

Question

I was working tonight to re-write an existing server health check script to store its values in a hashtable, and that part is working fine. However, I want the results to go to a CSV file, and that file only to be populated with servers where I've tagged them as requiring action. Currently those are generating event ID 7011, or failing a ping test by Test-Connection.
Here's the code:
$CheckServer = #{}
$Servers = (Get-Content $Dir\Test.txt)
foreach ($Server in $Servers) {
$CheckServer.EventID7011 = Get-Eventlog -LogName System -ComputerName $Server -Newest 1 |
Where-Object {$_.EventId -eq 7011} | select Message
if ($CheckServer.EventID -ne $Null) {
$CheckServer.Server = "$Server"
$CheckServer.ActionReq = "Yes"
}
$CheckServer.Ping = Test-Connection -ComputerName $Server -Count 1 -Quiet
if (! $CheckServer.Ping) {
$CheckServer.Server = "$Server"
$CheckServer.ActionReq ="Yes"
$CheckServer.Ping = "Offline"
} else {
$CheckServer.Server = "$Server"
$CheckServer.ActionReq = "No"
$CheckServer.Ping = "Online"
}
New-Object -TypeName PSObject -Property $CheckServer |
Export-Csv "ScanResults.csv" -NoTypeInformation -Append
}
I need the correct code at the end, as it stands, the script works fine for collecting/storing the data in the hashtable array $CheckServer, but I'd like to only select those servers that require action. So, if I'm scanning 100 servers, and 2 of them are in a ping fail state, I want only those selected and sent to Export-Csv.

Answer 1

If you want only servers that don't respond to Test-Connection in the output anyway it would be much simpler to just use a Where-Object filter on the server list:
Get-Content "$Dir\Test.txt" |
Where-Object { -not (Test-Connection -Computer $_ -Count 1 -Quiet) } |
Select-Object #{n='Server';e={$_}}, #{n='ActionReq';e={'Yes'}},
#{n='Ping';e={'Offline'}} |
Export-Csv 'ScanResults.csv' -NoType -Append

Answer 2

You need to store the objects into a list before you can filter and export them. See the lines with comments in your code:
$CheckServer = #{}
$serverObjects = #() # create a list of server objects
$Servers = (get-content $Dir\Test.txt)
ForEach ($Server in $Servers) {
$CheckServer.EventID7011 = get-eventlog -LogName System -ComputerName
$Server -newest 1 | where-object {$_.eventID -eq 7011} |select message
If ($CheckServer.EventID -ne $Null) {
$CheckServer.Server="$Server"
$CheckServer.ActionReq = "Yes"}
$CheckServer.Ping = Test-Connection -ComputerName $Server -count 1 -quiet
if (! $CheckServer.Ping) {
$CheckServer.Server="$Server"
$CheckServer.ActionReq ="Yes"
$CheckServer.Ping= "Offline"}
Else {
$CheckServer.Server="$Server"
$CheckServer.ActionReq ="No"
$CheckServer.Ping= "Online"}
# Add the server object to the list
$serverObjects += New-Object -TypeName PSObject -Property $CheckServer
}
}
# now filter it:
$serverObjects | where ActionReq -eq "Yes" | Export-Csv -Path "...."