Create a new Sharepoint WebApplication

$WebAppName = "abc - 80"

$WebAppHostHeader = "abc.com"

$WebAppPort = 80

$WebAppAppPool = abc - 80"

$URL = "http://insiderepublicservicesdevinside2013.com/"

$ap = New-SPAuthenticationProvider

$WebAppAppPoolAccount = "repsrv\test"

$WebAppDatabaseName = "testDb"

$WebAppDatabaseServer = "testServer"

$ap = New-SPAuthenticationProvider

# Create a new Sharepoint WebApplication

New-SPWebApplication -Name $WebAppName -Port $WebAppPort -HostHeader $WebAppHostHeader -URL $URL -ApplicationPool $WebAppAppPool -AuthenticationMethod "NTLM" -ApplicationPoolAccount (Get-SPManagedAccount $WebAppAppPoolAccount) -DatabaseName $WebAppDatabaseName -DatabaseServer $WebAppDatabaseServer –AuthenticationProvider $ap