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I am looking to set a site admins as the only people who can use a certain page via powershell, so far I have only been able to check permissions not set any

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EDIT: Misread the question you can try this

$site = get-spsite("http://MySPSite")
$web = $site.RootWeb
$list = $web.Lists["MyList"]
$listitem = $list.Items[0] 
$user = $web.AllUsers["Domain\User"]
$role = $web.RoleDefinitions["Full Control"]
$roleassignment = New-Object Microsoft.SharePoint.SPRoleAssignment($user)
$roleassignment.RoleDefinitionBindings.Add($role)
$listitem.RoleAssignments.Add($roleassignment)
$listitem.Update()

I'm not sure if this will break inheritance automatically, you may have to explicitly do that for this to work.

Use set-spuser for site permissions

SYNTAX
        Set-SPUser [-Identity] <SPUserPipeBind> [-AddPermissionLevel <String[]>] [-AssignmentCollection 
        <SPAssignmentCollection>] [-ClearPermissions <SwitchParameter>] [-Confirm [<SwitchParameter>]] 
        [-DisplayName <String>] [-Email <String>] [-Group <SPGroupPipeBind>] [-IsSiteCollectionAdmin 
        <SwitchParameter>] [-PassThru <SwitchParameter>] [-RemovePermissionLevel <String[]>] [-SyncFromAD 
        <SwitchParameter>] [-Web <SPWebPipeBind>] [-WhatIf [<SwitchParameter>]] [<CommonParameters>]


    DESCRIPTION
        The Set-SPUser cmdlet configures properties of an existing user.

An Example:

Set-SPUser -Identity 'domain\name' -Web http://sp2test/site -AddPermissionLevel Read
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  • Thanks for the fast response. So instead of -Identity "Domain\login" could I use. -Group $Site.AdministratorsGroup
    – user13186
    Mar 19, 2013 at 2:50
  • Groups take a bit more work. Take a look here and see if this doesn't work better for you sharepoint.stackexchange.com/questions/58293/… Mar 19, 2013 at 2:55
  • $listItem.RoleAssignments.Add did not work for me, I had to change it to $listItem.Web.RoleAssignments.Add
    – tsap
    Nov 11, 2015 at 17:57

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