Merging multiple csv into one Excel file without having Excel installed - powershell

Question

I am working on a script where I am trying to merge multiple csv into a single Excel file with csv filename as different sheet.
All the csv files have the same number of columns and name.
I don't have Excel installed on my server, so I've written this code using ImportExcel:
#Install-Module ImportExcel -scope CurrentUser
$path="C:\Scripts" #target folder
cd $path;
$csvs = Get-ChildItem .\* -Include *.csv
$csvCount = $csvs.Count
Write-Host "Detected the following CSV files: ($csvCount)"
foreach ($csv in $csvs) {
Write-Host " -"$csv.Name
}
$excelFileName = $path + "\" + $(get-date -f yyyyMMdd) + "_combined-data.xlsx"
Write-Host "Creating: $excelFileName"
foreach ($csv in $csvs) {
$csvPath = $path + $csv.Name
$worksheetName = $csv.Name.Replace(".csv","")
Write-Host " - Adding $worksheetName to $excelFileName"
Import-Csv -Path $csvPath | Export-Excel -Path $excelFileName -WorkSheetname $worksheetName
The script is taking time and executing without any issue but the Excel sheet is not being generated.
Please can you help me find and fix the issue in this script?

Answer 1

If you want to add a worksheet per CSV to your Excel file the code should look something like this:
$path = "D:\Testing"
$csvs = Get-ChildItem $path -Filter *.csv
$excelFileName = Join-Path $path -ChildPath "$(Get-Date -f yyyyMMdd)_combined-data.xlsx"
foreach ($csv in $csvs)
{
$props = #{
WorksheetName = $csv.BaseName
Path = $excelFileName
}
Import-Csv -Path $csv |
Export-Excel #props
}
If you want to do all in memory (more efficient than the example above), it's a bit more complicated. You need to use -PassThru.
Note, this works on ImportExcel 7.1.2, make sure you have the last up to date version.
$path = "D:\Testing"
$csvs = Get-ChildItem $path -Filter *.csv
$excelFileName = Join-Path $path -ChildPath "$(Get-Date -f yyyyMMdd)_combined-data.xlsx"
foreach ($csv in $csvs)
{
$content = Import-Csv -Path $csv
$props = #{
WorksheetName = $csv.BaseName
PassThru = $true
InputObject = $content
}
if(-not $xlsx)
{
$props.Path = $excelFileName
$xlsx = Export-Excel #props
continue
}
$props.ExcelPackage = $xlsx
Export-Excel #props > $null
}
Close-ExcelPackage $xlsx
If you want all CSV files on the same worksheet, assuming they all have the same headers:
$path = "D:\Testing"
$csvs = Get-ChildItem $path -Filter *.csv
$excelFileName = Join-Path $path -ChildPath "$(Get-Date -f yyyyMMdd)_combined-data.xlsx"
Import-Csv -Path $csvs |
Export-Excel -WorksheetName 'Merged' -Path $excelFileName