Import-Csv TrimEnd Column Header - csv

Question

I need import a CSV and run it through a foreach loop. I want to trim the end on the column header DeviceName to avoid any potential issues. I have tried the following but it is not working as expected.
$Import = Import-CSV $csv
foreach ($i in ($import.DeviceName).TrimEnd())
{do something}
Any help? Thank you!

Answer 1

If you need to change both the header and the content in the column for devicename which has spaces I have come up with this forgiving code.
$csvData = import-csv $csv
$properties = $csvData[0].psobject.Properties.name
$csvHeader = "`"$(($properties | ForEach-Object{$_.Trim()}) -join '","')`""
$deviceHeader = $properties -match "DeviceName"
$csvHeader
$csvHeader | Set-Content $file
$csvData | ForEach-Object{
$_.$deviceHeader = ($_.$deviceHeader).trim()
$_
} | ConvertTo-Csv -NoTypeInformation | Select-Object -Skip 1 | Add-Content $file
What this does is read in the CSV like normal. Parse the property names of the object in the order they appear. We find the one that has DeviceName no matter how many spaces (if there is more that one you could have a problem). Keep that so we can use it to call the correct property of each "row".
Export the new cleaned header to the file. Then we go through each "row" removing all the leading and trailing space from the DeviceName. Once that is done write back the CSV to the original file.

Answer 2

The best solution would be to tell the other team to fix their generation procedure. However, if for some reason that's not an option, I'd recommend pre-processing the file before you import it as a CSV.
$filename = 'C:\path\to\your.csv'
(Get-Content $filename -Raw) -replace '^(.*DeviceName)[ ]*(.*)', '$1$2' |
Set-Content $filename
Reading the file as a single string (-Raw) and anchoring the expression at the beginning of the string (^) ensures that only the column title is replaced.
For large input files you may want to consider a different approach, though, since the above reads the entire file into memory before replacing the first line.
$infile = 'C:\path\to\input.csv'
$outfile = 'C:\path\to\output.csv'
$firstLine = $true
Get-Content $infile | % {
if ($firstLine) {
$_ -replace '(DeviceName)[ ]*', '$1'
$firstLine = $false
} else {
$_
}
} | Set-Content $outfile
Thinking about it some more and taking inspiration from a comment to #Zeek's answer, you could also extract the headers first and then convert the rest of the file.
$infile = 'C:\path\to\input.csv'
$outfile = 'C:\path\to\output.csv'
$header = (Get-Content $infile -First 1) -split '\s*,\s*'
Get-Content $infile |
select -Skip 1 |
ConvertFrom-Csv -Header $header |
Export-Csv $outfile -NoType

Answer 3

Is this all you're trying to do? This will give you a collection of objects imported from your csv file but trim the end of the DeviceName property on each object.
$items = Import-CSV -Path $csv
$items.ForEach({ $_.DeviceName = $_.DeviceName.TrimEnd() })