Where filter with -like

Hello,

I'm trying to figure out how to make this script work, using a filter.  This script will look for CD-ROM drives that have a iso file mounted.

This works perfect.

Get-VM | Sort Name | Where-Object {$_.PowerState –eq “PoweredOn”} | Get-CDDrive | FT Parent, IsoPath

This is what I'm trying to make work, using a filter.

Get-VM | Sort Name | Where-Object {$_.PowerState –eq “PoweredOn”} | Get-CDDrive | FT Parent, IsoPath | Where { $_.IsoPath -like $null }

Or this

Get-VM | Sort Name | Where-Object {$_.PowerState –eq “PoweredOn”} | Get-CDDrive | FT Parent, IsoPath  | Where { $_.IsoPath -like ''null" }

Or this

Get-VM | Sort Name | Where-Object {$_.PowerState –eq “PoweredOn”} | Get-CDDrive | FT Parent, IsoPath  | Where { $_.IsoPath -ne '" }

Any help would be great.

Thanks,

-Mike