How do I group and sum CSV rows by shared column value? - windows

Question

I'm new with powershell and I am currently stuck with an issue.
I import a CSV file with 2 columns (ServerName, and Size)
like this :
Server | Size
-------------
SRV1 | 140
SRV2 | 120
SRV1 | 100
SRV1 | 140
SRV2 | 200
I want to add all Size values for each server, for example:
SRV2 = 120+200
SRV1 = 140+100+140
I have no idea how to do it.
I tried with a for loop, but the operation is done for each line, so my results are false.
Could anyone help me ?

Answer 1

Use:
the Group-Object cmdlet to group the CSV rows by server name (Server)
then use Select-Object to construct a single output object per group,
containing the server name and the sum of all the associated rows' Size values, obtained via a calculated property that uses the Measure-Object cmdlet:
Import-Csv file.csv | Group-Object Server |
Select-Object Name, #{ n='Size'; e={ ($_.Group | Measure-Object Size -Sum).Sum } }
If you want the first output column to be named Server, replace Name with #{ n='Server'; e='Name' }
With your sample data, the above yields:
Name Size
---- ----
SRV1 380
SRV2 320

Answer 2

Here is an example how you could do it:
$Data = Import-Csv -Path "yourfilepath" -Delimiter ";"
$SortedData = $Data | Group {$_.server}
$Hashtable = #{}
$SortedData.group | ForEach-Object {
if ($Hashtable.Contains($_.server)) {
$Hashtable[$_.server] += ",$($_.size)"
} else {
$Hashtable.Add($_.server,$_.size)
}
}
You need to change your delimiter in your case