start IIS pools

Hi;

I would like via a power shell to check if the IIS applications pool are stopped then I started it all  but except the pools "SharePoint Web Services Root" : its always stopped.
How write in power shell the different symbol (!= or no match the string) ?

$env:windir\system32\inetsrv\appcmd list apppools /name:"$=*SharePoint Web Services Root*" /XML | ...

Regards;