Creates a new user profile in the UPA

CreateUserProfile.ps1

Add-PSSnapin Microsoft.SharePoint.PowerShell

$siteUrl = "http://mycoolsite/"
$accountName = "MyAccountName"

$site = Get-SPSite $siteUrl 
$context = Get-SPServiceContext($site) 
$pm = new-object Microsoft.Office.Server.UserProfiles.UserProfileManager($context)

# If user profile doesn't exist create new one
if ($pm.UserExists($accountName)) {
    $userProfile = $pm.GetUserProfile($accountName) 
} else  {
    $userProfile = $pm.CreateUserProfile($accountName)
}
# Update user profile properties
$userProfile["FirstName"].Value = "Bill"
$userProfile["LastName"].Value = "Gates"
# Commit changes
$userProfile.Commit()