POWERSHELL how to combine several csv into one excel

Question

I am trying to download all CSV files from the \tmp\ directory with a PS script and convert them to one excel file as a report and place it in the \reports\ directory under the name LDAP.xlsx . My CSV files have varying amounts of saved data.

In the forum I found this how-to-export-a-csv-to-excel-using-powershell and my code looks like this:

Clear-Host
# SOURCE
##########
# config file
$conf_file = "C:\PS_LDAP_searchlight\config\searchlight_conf.conf"
$conf_values = Get-Content $conf_file | Out-String | ConvertFrom-StringData

# variables from config file
$main_path = $conf_values.main_path
$tmp_path = $conf_values.tmp_path
$reports_path = $conf_values.reports_path

# PROGRAM
##########
$workingdir = $main_path + $tmp_path + "*.csv"
$reportsdir = $main_path + $reports_path
$csv = dir -path $workingdir
foreach($inputCSV in $csv){
$outputXLSX = $reportsdir + "\" + $inputCSV.Basename + ".xlsx"
### Create a new Excel Workbook with one empty sheet
$excel = New-Object -ComObject excel.application 
$excel.DisplayAlerts = $False
$workbook = $excel.Workbooks.Add(1)
$worksheet = $workbook.worksheets.Item(1)
### Build the QueryTables.Add command
### QueryTables does the same as when clicking "Data » From Text" in Excel
$TxtConnector = ("TEXT;" + $inputCSV)
$Connector = $worksheet.QueryTables.add($TxtConnector,$worksheet.Range("A1"))
$query = $worksheet.QueryTables.item($Connector.name)
### Set the delimiter (, or ;) according to your regional settings
### $Excel.Application.International(3) = ,
### $Excel.Application.International(5) = ;
$query.TextFileOtherDelimiter = $Excel.Application.International(5)
### Set the format to delimited and text for every column
### A trick to create an array of 2s is used with the preceding comma
$query.TextFileParseType  = 1
$query.TextFileColumnDataTypes = ,2 * $worksheet.Cells.Columns.Count
$query.AdjustColumnWidth = 1
### Execute & delete the import query
$query.Refresh()
$query.Delete()
### Save & close the Workbook as XLSX. Change the output extension for Excel 2003
$Workbook.SaveAs($outputXLSX,51)
$excel.Quit()

# Cleaner
$inputCSV = $null
$outputXLSX = $null

}
## To exclude an item, use the '-exclude' parameter (wildcards if needed)
#remove-item -path $workingdir -exclude *Crab4dq.csv

# CLEANER
###############################
# SOURCE
###############################
# config file
    $conf_file = $null
    $conf_values = $null
# variables from config file
    $main_path = $null
    $tmp_path = $null
    $reports_path = $null
# PROGRAM
###############################
    $workingdir = $null
    $csv = $null
    $reportsdir = $null

the code reads all files but writes one to one. I need help and explanation on how to make a many-to-one option. I would like each CSV file to be saved as a separate sheet under its own name like:

users_all_inf.csv in excel\sheet1 => users_all_inf
active_users_last_logon_year_ago.csv in excel\sheet2 => active_users_last_logon_year_ago
nextfilename.csv in excel\next_sheet => nextfilename

so that all data will be available in one excel report.xlsx file.
I will be grateful for any hint or help in converting the code.

Answer 1

Finally my code looks like:

Clear-Host
# config file
$conf_file = "C:\SEARCHLIGHT\config\searchlight_conf.conf"
$conf_values = Get-Content $conf_file | Out-String | ConvertFrom-StringData

# variables from config file
$main_path = $conf_values.main_path
$tmp_path = $conf_values.tmp_path
$reports_path = $conf_values.reports_path
$system_name = $conf_values.system_name

$tmp_dir = $main_path + $tmp_path + "*" # source file
$outputfilename = $(get-date -f yyyyMMdd) + "_" + $system_name + "_report.xlsx" # destination file with date
    
# get list of csvs files
$csvs = Get-ChildItem $tmp_dir -Include *.csv
$y = $csvs.Count
Write-Host "Detected the following CSV files: ($y)"
foreach ($csv in $csvs) {
    Write-Host " "$csv.Name
}

Write-Host Creating: $outputfilename
# Create a new Excel workbook
$excelapp = new-object -comobject Excel.Application
$excelapp.sheetsInNewWorkbook = $csvs.Count
$xlsx = $excelapp.Workbooks.Add()
$sheet=1
$delimiter = ";" # delimiter used in the csv file
foreach ($csv in $csvs) {
    #$row=1
    #$column=1
    $worksheet = $xlsx.Worksheets.Item($sheet)
    $worksheet.Name = $csv.Name
    # Build the QueryTables.Add command and reformat the data
    $TxtConnector = ("TEXT;" + $csv)
    $Connector = $worksheet.QueryTables.add($TxtConnector,$worksheet.Range("A1"))
    $query = $worksheet.QueryTables.item($Connector.name)
    $query.TextFileOtherDelimiter = $delimiter
    $query.TextFileParseType = 1
    $query.TextFileColumnDataTypes = ,1 * $worksheet.Cells.Columns.Count
    $query.AdjustColumnWidth = 1
    # Execute & delete the import query
    $query.Refresh()
    $query.Delete()
    $sheet++
} # end foreach ($csv in $csvs)
# Save & close the Workbook as XLSX
$output = $main_path + $reports_path + $outputfilename
$xlsx.SaveAs($output)
$excelapp.quit()

Answer 2

Please find the github link on using ImportExcel module. https://github.com/dfinke/ImportExcel/tree/master/Examples

$outputFile = "C:\Temp\OutputExcelFile.xlsx" #Output File
$csvFiles = Get-childItem -Filter *.csv # Filtering CSV file in my present working dir
foreach ($csvFile in $csvFiles) {
#Import csv file and export it contents to Output excel file and rename the sheet.
Import-csv $csvFile | Export-Excel $outputFile -WorksheetName $csvFile.BaseName
}

Hope it helps.