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How to extract information from one CSV file using information in another

This question came from a user who needed to use a list of users names in one csv file to select what information will be extracted from another csv file.  To set this up, I created two csv files.  The first one, UserData.csv, contains a list of users and some data associated with each one.

 

UserName,Prop1,Prop2
Jason,abc,123
Matt,456,789
Debbie,def,123
Beth,456,thr
Tom,der,324

The second file, UserName.csv, contains only the users whose information I want to extract from the UserData.cvs file.

UserName
Jason
Debbie

Here is the code.

 

$Path = "C:\PowerShell"

 

$UserList = Import-Csv -Path "$($path)\UserName.csv"

$UserData = Import-Csv -Path "$($path)\UserData.csv"

 

foreach ($User in $UserList)

{

    ForEach ($Data in $UserData)

    {

        If($User.Username -eq $Data.UserName)

        {

            # Process the data

            $Data

        }

    }

 

}

Now, if you want to keep the data flowing through the PowerShell Pipeline, try this code instead.

$Path = "C:\PowerShell"

 

$UserList = Import-Csv -Path "$($path)\UserName.csv"

$UserData = Import-Csv -Path "$($path)\UserData.csv"

 

$UserList | ForEach-Object { $User = $_

    $UserData | ForEach-Object {

        If ($User.Username -eq $_.UserName)

        {

            Write-Output $_

        }

    }

} | FT -AutoSize # Keep it in the pipeline.

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