Powershell aggregation of varying CSV Files to one CSV

Hi,
I have a daily CSV File that is created but it content changes daily, it is basicly a mail count result.
I want to aggregate the CSV's that are created daily into one file weekly.

file on Sunday would look like this:

Alias, Count
Kevin,1
Jim,2
Roki,1

The file on monday would be :
Alias, Count
Roger,1
Jim, 4
Ralph,1

the weekly aggregated file would have need to look like this (note Jim with 6 mails as an aggregated count):
Alias, Count
Jim, 6
Kevin,1
Ralph,1
Roger,1
roki,1

I know how to aggregate  CSV's but how'd it be done powershell with files that change...
Thanks!
Elad-ItAsked:
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soostibiCommented:
I would do this, assuming the files are agg1.txt, agg2.txt, etc. You can adjust the get-item part according to the actual filenames and path:
Get-Item c:\ee\agg*.txt | Import-Csv | Group-Object -Property alias | 
	Select-Object name,  @{n="sum"; e={($_.group | Measure-Object -Property count -Sum).sum}}

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Elad-ItAuthor Commented:
That works... its simple suddnly when its just writen like that :)
Thanks!!
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Elad-ItAuthor Commented:
Thanks!
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