Merging multiple CSV files into one using PowerShell

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If you’re after a one-liner you can pipe each csv to an Import-Csv and then immediately pipe that to Export-Csv. This will retain the initial header row and exclude the remaining files header rows. It will also process each csv one at a time rather than loading all into memory and then dumping them into your merged csv.

Get-ChildItem -Filter *.csv | Select-Object -ExpandProperty FullName | Import-Csv | Export-Csv .\merged\merged.csv -NoTypeInformation -Append

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