promote_to_admin.ps1

"Getting currently logged in user"
$user = '{0}\{1}' -f $env:USERDOMAIN, $env:USERNAME

"Working with user account: " + $user

$user_members = Get-LocalGroupMember -Group Administrators

if ($user_members.Name -like $user) {
     $user + " is already a member of the Administrators group"
}
else {
    "Promoting user to Administrators group"
    Add-LocalGroupMember -Group Administrators -Member $user
    if($?) {
        "User was added to the Administrators group"
    }
    else {
        "Something went wrong when adding the user to the Admins group."
        exit 1
    }
}

#Value  Description
#0 Show OK button.
#1 Show OK and Cancel buttons.
#2 Show Abort, Retry, and Ignore buttons.
#3 Show Yes, No, and Cancel buttons.
#4 Show Yes and No buttons.
#5 Show Retry and Cancel buttons.
#http://msdn.microsoft.com/en-us/library/x83z1d9f(v=vs.84).aspx

$prompt = new-object -comobject wscript.shell
$answer = $prompt.popup("You have been granted admin rights for the next 15 minutes. Please use it wisely.",60,"Datadog Corp IT",0) #first number is timeout, second is display.
Start-Sleep -s 900

$user_members = Get-LocalGroupMember -Group Users
if ($user_members.Name -like $user) {
        $user + " is already a member of the Users group"
}
else {
    "Adding user to Users group"
    Add-LocalGroupMember -Group Users -Member $user
    if($?) {
        "User was added to the users group"
    }
    else {
        "Something went wrong when adding the user to the Users group. Will not demote"
        exit 1
    }
}
"Removing user from Admins group"
Remove-LocalGroupMember -Group Administrators -Member $user