PowerShell WMI filter on variable

Question

This is not the exact scenario of what I'm trying to accomplish but is a good example of where I am stuck.

$Path = "\\192.168.1.1\config"
Get-CimInstance -Namespace ROOT\CIMV2 -ClassName Win32_MappedLogicalDisk -Filter "ProviderName=$Path"

This produces an "Invalid Query" error as it's trying to use \\ in the query

I know I can do this manually by using:

Get-CimInstance -Namespace ROOT\CIMV2 -ClassName Win32_MappedLogicalDisk -Filter "ProviderName='`\\`\\192.168.1.1`\\config'"

This doesn't solve my problem as I need to pass the value from a variable

Any help would be greatly appreciated

I also don't want to query the whole class and then filter after. e.g. Get-CimInstance -Namespace ROOT\CIMV2 -ClassName Win32_MappedLogicalDisk | where {$_.ProviderName -eq $Path} as it will slow down the script massively — Saars
– Saars, Commented Sep 23, 2020 at 5:35

AdminOfThings · Accepted Answer · 2020-09-23 06:07:51Z

1

You can do an inline replace to escape the backslashes:

$Path = "\\192.168.1.1\config"
Get-CimInstance -Namespace ROOT\CIMV2 -ClassName Win32_MappedLogicalDisk -Filter "ProviderName='$($Path -replace '\\','\\')'"

Note: Don't forget to put single quotes around the value part of the filter.

$() is the subexpression operator. Since -replace uses regex, a single \ must also be escaped for the match expression.

answered Sep 23, 2020 at 6:07

AdminOfThings

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