set-credentials-on-all-app-pools.ps1

<#
  Quick little script to set credentials on IIS sites 
#>

Import-Module WebAdministration

$dev_username = ''
$dev_password = ''

$qa_username = ''
$qa_password = ''

$uat_username = ''
$uat_password = ''

Get-ChildItem IIS:\AppPools\ | foreach {

    $app_pool_name = $_.Name

	Write-Host "$app_pool_name"
    $input = Read-Host

    switch ($input) 
    {
        'dev' {
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.identityType -Value SpecificUser 
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.userName -Value $dev_username
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.password -Value $dev_password
        }
        
        'qa' {
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.identityType -Value SpecificUser 
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.userName -Value $qa_username
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.password -Value $qa_password
        }
        
        'uat' {            
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.identityType -Value SpecificUser 
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.userName -Value $uat_username
            Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.password -Value $uat_password
        }
    }
}