Add a User or Group to the SPWebApplication User Policy for all Web Applications in the farm using Powershell Commnd

We can do this by Graphical Method from Central Admin at top Ribbon there is option of User Policy. Here i have done by Powershell command.

• Full Control - Has full control.

$userOrGroup = "SPSERVER2\administrator"
$displayName = "SharePoint Admin"

Get-SPWebApplication http://spserver2:5011 | foreach {
    $webApp = $_
    $policy = $webApp.Policies.Add($userOrGroup, $displayName)
    $policyRole = $webApp.PolicyRoles.GetSpecialRole([Microsoft.SharePoint.Administration.SPPolicyRoleType]::FullControl)
    $policy.PolicyRoleBindings.Add($policyRole)
    $webApp.Update()
}

• Full Read - Has full read-only access.

$userOrGroup = "SPSERVER2\administrator"
$displayName = "Search Account"

Get-SPWebApplication http://spserver2:5011 | foreach {
    $webApp = $_
    $policy = $webApp.Policies.Add($userOrGroup, $displayName)
    $policyRole = $webApp.PolicyRoles.GetSpecialRole([Microsoft.SharePoint.Administration.SPPolicyRoleType]::FullRead)
    $policy.PolicyRoleBindings.Add($policyRole)
    $webApp.Update()
}