In this example we want to hide the column in the "NewForm.aspx" page, we are hiding the “hide column” using the below Power Shell script.
#Get the site that you want to access the list
$webUrl = Get-SPWeb http://dotnetsharepoint/sites/sharepoint/
#Get the list name
$listname = $webUrl.Lists["DemoHideColumn"]
#Get the Column that you want to hide
$columnName = $listname.Fields["HideColumn"]
# hide the column from New Form using the ShowInNewForm property
#if you want to show it again change to $true
After completing the Power Shell we can get the Output as shown below in the NewForm.apsx.