Powershell小技巧之通过EventLog查看近期电脑开机和关机时间

机器开机和关机时写在eventlog中的第一条日志和最后一条日志分别为：6005和6006。

timecreated           id leveldisplayname message
-----------           -- ---------------- -------
8/18/2014 9:23:04 am     6005 information   the event log service was started.  
8/15/2014 7:03:48 pm     6006 information   the event log service was stopped.

所以根据上面的信息很容易得出机器的开机，关机，在线时间，代码为：

function get-computeruptimehistory { 
 $q=' 
<querylist> 
 <query id="0" path="system"> 
  <select path="system">*[system[(eventid=6005 or eventid=6006)]]</select> 
 </query> 
</querylist>'
$events = get-winevent -filterxml $q
$i=-1 
while ( $i+1 -lt $events.length ) { 
 if($i -eq -1) 
 { 
 [pscustomobject]@{ 
 starttime = $events[0].timecreated; 
 stoptime = $null ; 
 uptime = [datetime]::now - $events[0].timecreated 
 } 
 } 
 else{ 
 [pscustomobject]@{ 
 starttime = $events[$i+1].timecreated; 
 stoptime = $events[$i].timecreated ; 
 uptime = $events[$i].timecreated - $events[$i+1].timecreated 
 } 
 } 
 $i += 2 
} 
 
}

输出为：

ps> get-computeruptimehistory | ft -autosize

starttime       stoptime       uptime
---------       --------       ------
8/18/2014 9:23:04 am            2.05:00:22.5891685
8/13/2014 9:30:42 am 8/15/2014 7:03:48 pm 2.09:33:06
7/22/2014 12:16:09 pm 8/13/2014 9:29:09 am 21.21:13:00
7/22/2014 9:23:08 am 7/22/2014 11:26:08 am 02:03:00
7/17/2014 11:08:57 am 7/21/2014 6:20:28 pm 4.07:11:31
7/14/2014 9:35:11 am 7/17/2014 11:07:25 am 3.01:32:14
7/10/2014 3:01:53 pm 7/14/2014 9:21:48 am 3.18:19:55
7/8/2014 5:04:02 pm  7/10/2014 2:58:36 pm 1.21:54:34
6/30/2014 9:17:28 am 7/8/2014 5:01:24 pm  8.07:43:56
6/29/2014 10:24:50 am 6/29/2014 6:04:09 pm 07:39:19
6/20/2014 9:33:08 am 6/27/2014 6:18:34 pm 7.08:45:26
6/16/2014 3:05:45 pm 6/20/2014 9:31:16 am 3.18:25:31
6/12/2014 9:40:05 am 6/16/2014 3:04:02 pm 4.05:23:57
6/6/2014 2:52:11 pm  6/12/2014 9:37:46 am 5.18:45:35
6/5/2014 10:55:20 am 6/6/2014 2:51:09 pm  1.03:55:49
6/5/2014 9:19:38 am  6/5/2014 10:54:04 am 01:34:26
6/3/2014 1:33:24 pm  6/4/2014 7:58:58 pm  1.06:25:34
5/30/2014 10:07:06 am 6/3/2014 1:31:24 pm  4.03:24:18
5/29/2014 5:30:33 pm 5/30/2014 9:41:41 am 16:11:08
5/29/2014 5:28:57 pm 5/29/2014 5:29:43 pm 00:00:46
5/29/2014 2:52:58 pm 5/29/2014 5:26:57 pm 02:33:59
5/29/2014 2:50:31 pm 5/29/2014 2:51:06 pm 00:00:35
5/27/2014 11:54:43 am 5/29/2014 2:47:29 pm 2.02:52:46
5/23/2014 5:31:18 pm 5/26/2014 9:16:33 am 2.15:45:15
5/22/2014 6:00:29 pm 5/23/2014 9:16:45 am 15:16:16
5/21/2014 4:38:22 pm 5/21/2014 4:40:07 pm 00:01:45
5/21/2014 9:43:59 am 5/21/2014 4:36:34 pm 06:52:35
5/19/2014 11:27:28 am 5/21/2014 9:42:32 am 1.22:15:04
5/19/2014 9:25:56 am 5/19/2014 9:27:00 am 00:01:04
5/15/2014 9:23:15 am 5/15/2014 9:24:16 am 00:01:01
5/15/2014 11:18:45 am 5/15/2014 11:19:49 am 00:01:04