批量ping，并输出ping不通的ip

batch_ping.ps1

$stringlist =
'192.168.36.104',
'192.168.36.130',
'192.168.22.126',
'192.168.50.111',
'192.168.36.129',
'192.168.36.133'

# http://ilovepowershell.com/2010/04/13/powershell-how-to-ping-computers/ 
$ping = new-object system.net.networkinformation.ping
$pingreturns = [ordered]@{}

foreach ($entry in $stringlist) {
  $pingreturns.Add($entry, $ping.send($entry).Status)
}

$pingreturns.GetEnumerator() | ?{ $_.Value -eq "TimedOut" }

powershell 正则表达式提取 ip地址： http://stackoverflow.com/questions/31178400/regex-to-extract-an-ip-address-from-a-string