写一个脚本来验证域控之间信息同步的时间间隔

修改description这个属性，在两台域控上观察这个属性变化的时间戳。顺便搞搞清楚两种循环的区别，DoUntil是条件满足才终止，DoWhile是条件不满足即终止。

Do...Until写法：

Set-ADUser -Server corp-dc5-was -Identity 'CN=name1,OU=users,DC=corp,DC=contoso,DC=com' -Description 'Admin Account 1'
$start = Get-Date
Write-Host -NoNewline 'Syncing'
do {
  Write-Host -NoNewline '.'
  Start-Sleep -Seconds 1
}
until (
  (Get-ADUser -Server corp-dc1-chn -Identity 'CN=name1,OU=users,DC=corp,DC=contoso,DC=com' -Properties description).description -eq 'Admin Account 1'
)
$end = Get-Date
"`nStart on: $start"
"End on: $end"
"Interval: " + ($end - $start)

 Do...While写法：

$dn = 'CN=name1,OU=users,DC=contoso,DC=com'
Set-ADUser -Server corp-dc5-was -Identity $dn -Description 'Admin Account 1'
$start = Get-Date
Write-Host -NoNewline 'Syncing'
do {
  Write-Host -NoNewline '.'
  Start-Sleep -Seconds 1
}
while (
  (Get-ADUser -Server corp-dc1-chn -Identity $dn -Properties description).description -eq 'Admin Account'
)
$end = Get-Date
"`nStart on: $start" 
"End on: $end"
"Interval: " + ($end - $start)