Get-Printer cmdlet applied to multiple remote servers - powershell

Question

I'm trying to run the cmdlet "Get-Printer" and apply it to multiple computers but I get an error message I tried using double quotations marks and get a same error message.
"Get-Printer : Cannot process argument transformation on parameter 'ComputerName'. Cannot convert value to type System.String."
Get-Printer -ComputerName 'server01', 'server02'|select-object -Property Name, PortName |Select-String -Pattern 127.0.0.1
is it because get-printer cmdlet can only be applied to one server at a time? do I have to take a different approach to be able to apply it to multiple servers?

Answer 1

ComputerName is a string not an array. See the documentation for Get-Printer.
You can however use another pipe (|) at the beginning followed by a block beginning with a % (shorthand for ForEach-Object) in order to feed the strings to the cmdlet one at a time. It would look something like this:
'server01', 'server02' |
%{Get-Printer -ComputerName $_} |
Select-Object -Property Name, PortName |
Select-String -Pattern 127.0.0.1
There is a second issue with this though. Select-String also expects a string, but you're passing it an object containing Name and PortName. Instead of using Select-String, you could probably just pipe it to a block prefixed by ? (shorthand for Where-Object) and check if PortName contains 127.0.0.1.
Adding this would look like:
'server01', 'server02' |
%{Get-Printer -ComputerName $_} |
Select-Object -Property Name, PortName |
?{$_.PortName.Contains("127.0.0.1")}
If you would like, you can also shorten Select-Object to just Select, but I'll leave that up to you.

Answer 2

The help of Get-Printer shows that the parameter -ComputerName accepts input of type string, but not string array. So you can only specify a single computer name.
https://learn.microsoft.com/en-us/powershell/module/printmanagement/get-printer?view=windowsserver2019-ps
What you can do however, is to define the array of computer names first and then use a foreach.
$computers = "server01","server02"
foreach($computer in $computers)
{
Get-Printer -ComputerName $computer |select-object -Property Name, PortName | Select-String -Pattern 127.0.0.1
}
Or like Jesse suggested above a one liner would look like this:
"server01","server02" | ForEach-Object {Get-Printer -ComputerName $_} | Select-Object -Property Name, PortName | Select-String -Pattern 127.0.0.1