evalute expression output into variable in PowerShell - powershell

Question

I want to be able to build a Get-ADComputer command after building it from strings like so:
$FilterOperatingSystems = "*Windows 7*" -or OperatingSystem -like "*Windows 8*" -or OperatingSystem -like "*Windows 10*"
($FilterOperatingSystems is a parameter to the script, so it'll be future proofed when executed by a Task Scheduler)
$command='Get-ADComputer -properties OperatingSystem -Filter {(OperatingSystem -like '+$FilterOperatingSystems+' )} |'
$command+= 'Where-Object {$_.name -like "*-*"} | '
$command+= 'Where-Object {$_.name -NotLike "V7-*"} | '
$command+= 'Where-Object {$_.name -NotLike "*-NONE"} | '
$command+= 'Where-Object {$_.name -NotLike "*-ONCALL"} | '
$command+= 'Where-Object {$_.name -NotLike "*-BLACKBAUD"} | '
$command+= 'Where-Object {$|_.name -NotLike "SC-WIN7-1"} | '
$command+= 'Where-Object {$_.name -NotLike "UT-SWCLIENT-01"} | '
$command+= 'Select-Object -Expand Name'
Write-Host $command
$computer =iex $command
the $command comes out like this:
Get-ADComputer -properties OperatingSystem -Filter {(OperatingSystem -like "*Windows 7*" -or OperatingSystem -like "*Windows 8*" -or OperatingSystem
-like "*Windows 10*" )} |Where-Object {$_.name -like "*-*"} | Where-Object {$_.name -NotLike "V7-*"} | Where-Object {$_.name -NotLike "*-NONE"} | W
here-Object {$_.name -NotLike "*-ONCALL"} | Where-Object {$_.name -NotLike "*-BLACKBAUD"} | Where-Object {$|_.name -NotLike "SC-WIN7-1"} | Where-Obje
ct {$_.name -NotLike "UT-SWCLIENT-01"} | Select-Object -Expand Name
but I get an error:
$ : The term '$' is not recognized as the name of a cmdlet, function,
script file, or operable program. Check the spelling of the name, or
if a path was included, verify that the path is correct and try again.
So, is it possible to do something like that? And if so, what's the right approach?

Answer 1

I think you just have a typo:
$|_.name -NotLike "SC-WIN7-1"
Should that not be $_.name?