Function to run conditional on CSV and delete line if true

Question

It's Friday and my brain is focusing more on the weekend than work, so I ask your help, oh PowerShell community:
I've been tasked with converting our old VB new user script to Powershell, the input of which is a CSV that HR sends us on a daily basis. On rare occasion they include someone who already exists as a user, and I'd like to write a function to check the CSV
for that and remove that line in the CSV before continuing processing. So far I have the following:
Function Clear-Existing
param
[string]$path
$csv_input = import-csv -Delimiter ',' $path -Header @("EmpID","LastName","FirstName","Title","Dept","Status") | % ( $_.EmpID
foreach ($entry in $csv_input)
if (Check-ADUser $entry.EmpID -eq $true)
write-host "user $entry already exists!"
But being said Friday, I can't figure out how to remove the "offending" line from the CSV and save it.
[email protected]

Answer 1

Try something like this, you may want to change the path on the Export-Csv file to verify first, so that way you don't overwrite your file
Function Clear-Existing
param
[string]$path
$results = @()
import-csv -Delimiter ',' $path -Header @("EmpID","LastName","FirstName","Title","Dept","Status") | ForEach {
if (Check-ADUser $_.EmpID -eq $true)
write-host "user $entry already exists!"
else
$results += $_
$results | Export-Csv $path
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