Create Service Principal in Powershell and login to azure

ServicePrinciplePowershell.ps1

#Create AD app
$dummyUrl = "https://dummy.dummy.com"
$passpowrd = "Qwerty@123!"
$securePassword = ConvertTo-SecureString -String $passpowrd -AsPlainText  -Force
$app = New-AzureRmADApplication -DisplayName $dummyUrl `
    -IdentifierUris $dummyUrl `
    -HomePage $dummyUrl `
    -Password $securePassword -Verbose

#Create Service principal
New-AzureRmADServicePrincipal -ApplicationId $app.ApplicationId `
    -DisplayName $dummyUrl `
    -Password $securePassword `
    -Scope "/subscriptions/<SUBSCRIPTION ID>" `
    -Role Contributor `
    -StartDate ([datetime]::Now) `
    -EndDate $([datetime]::now.AddYears(1)) -Verbose


    
#Login with service principal

$clientId = "<CLIENT ID>"
$credentials = New-Object System.Management.Automation.PSCredential ($clientId, $securePassword)
Login-AzureRmAccount -ServicePrincipal -TenantId "<TENANTID>" `
    -SubscriptionId "<SUBSCRIPTIONID>" `
    -Credential $credentials