Process Model Settings for an Application Pool

To set an AppPool to run under a different user, in poqwershell :

Set-ItemProperty IIS:\AppPools\MyAppPool -name processModel.identityType -value X

Where X =
0 = LocalSystem
1 = LocalService
2 = NetworkService
3 = SpecificUser
4 = ApplicationPoolIdentity

http://www.iis.net/configreference/system.applicationhost/applicationpools/add/processmodel

List all IIS Web Applications with the .net version, the state of the Web Application and the assigned user/identity.

List all IIS Web Applications with the .net version, the state of the Web Application and the assigned user/identity.

try{
Import-Module WebAdministration
Get-WebApplication

$webapps = Get-WebApplication
$list = @()
foreach ($webapp in get-childitem IIS:\AppPools\)
{
$name = "IIS:\AppPools\" + $webapp.name
$item = @{}

$item.WebAppName = $webapp.name
$item.Version = (Get-ItemProperty $name managedRuntimeVersion).Value
$item.State = (Get-WebAppPoolState -Name $webapp.name).Value
$item.UserIdentityType = $webapp.processModel.identityType
$item.Username = $webapp.processModel.userName
$item.Password = $webapp.processModel.password

$obj = New-Object PSObject -Property $item
$list += $obj
}

$list | Format-Table -a -Property "WebAppName", "Version", "State", "UserIdentityType", "Username", "Password"

}catch
{
$ExceptionMessage = "Error in Line: " + $_.Exception.Line + ". " + $_.Exception.GetType().FullName + ": " + $_.Exception.Message + " Stacktrace: " + $_.Exception.StackTrace
$ExceptionMessage
}

the output is a table:

WebAppName	Version	State	UserIdentityType	Username	Password
Web123	v2.0	Started	SpecificUser	test\webuser	P@55w04D

From : https://melcher.it/2013/03/powershell-list-all-iis-webapplications-net-version-state-identity/