Get latest dates from an array per object group in Powershell

问题

I have an array $data :

PS> $data
Datum                  User                   Computer                                      
-----                  ---------              --------                                      
10/06/2013 13:10:56    geb1@TESTDOMAIN.COM    DC1$                                          
10/06/2013 13:09:25    geb2@TESTDOMAIN.COM    DC2$                                          
10/06/2013 10:05:13    geb2@TESTDOMAIN.COM    DC2$                                          
7/06/2013 16:32:47     geb1@TESTDOMAIN.COM    DC1$    

I want to get the latest dates from the $data array for each computer like this:

PS> $result
Datum                  User                   Computer                                      
-----                  ---------              --------                                      
10/06/2013 13:10:56    geb1@TESTDOMAIN.COM    DC1$                                          
10/06/2013 13:09:25    geb2@TESTDOMAIN.COM    DC2$                                          

I really couldn't get this result. Could you please help me on this?

回答1:

$data | Foreach-Object {$_.Datum = [DateTime]$_.Datum; $_} | 
Group-Object Computer | 
Foreach-Object {$_.Group | Sort-Object Datum | Select-Object -Last 1}

回答2:

Maybe you use the $GET_[]; statement?

回答3:

This should work, but I can't test it now:

$result =$data | sort computer,{ [datetime]$_.datum } -desc | group computer | % { $_.group[0] }

来源：https://stackoverflow.com/questions/17025450/get-latest-dates-from-an-array-per-object-group-in-powershell