Check whether IIS is installed or not
if ((Get-WindowsFeature Web-Server).InstallState -eq "Installed") { Write-Host "IIS is installed on $vm"} else { Write-Host "IIS is not installed on $vm"}
I needed to do this for a list of several hundred servers today. I modified the previous answer to use get-service w3svc instead of WMI installed state. This seems to be working for me so far.
$servers = get-content c:\listofservers.txtforeach($server in $servers){$service = get-service -ComputerName $server w3svc -ErrorAction SilentlyContinueif($service){Write-Host "IIS installed on $server"} else {Write-Host "IIS is not installed on $server"}}
In an elevated Powershell window this works for me:
On Windows Server 2012 (on Windows Server 2008 first run this: Import-Module ServerManager)
if ((Get-WindowsFeature Web-Server).Installed) { Write-Host "IIS installed"} On Windows 10
if ((Get-WindowsOptionalFeature -Online -FeatureName "IIS-WebServerRole").State -eq "Enabled") { Write-Host "IIS installed"}