Modifying Existing CSV file in Powershell - powershell

Question

I have a script that I am setting up to do some migration of users' Exchange mailboxes into .pst file. The idea was that I would have a CSV file that I could put users' names on and then when the script kicked off nightly it would open the CSV file and find users that have been added, perform the requested actions on those users accounts (export, move set permissions etc) and then write back to the CSV file Marking those users as completed and writing the date on which they were completed. Here is what I have so far.
$InPstPath = '\\server1\PST_Store\'
$OutPstPath = '\\server2\PST_Store\'
$User = Get-Content $OutPstPath'login.txt'
$PWord = cat $OutPstPath'pass.txt' | convertto-securestring
$Credentials = New-Object –TypeName System.Management.Automation.PSCredential –ArgumentList $User, $PWord
$PSSession = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri http://Server1/powershell -Credential $Credentials
Import-PSSession $PSSession
$In_List = Invoke-Command {Import-Csv "\\Server1\PST_Store\Admin\To_Be_Exported.csv"} -computername Server1 -Credential $Credentials
foreach ($objUser in $In_List) {
if ($objUser.Completed -ne "Yes") {
$TargetUser = $objUser.name
$ShortDate = (Get-Date).toshortdatestring()
New-MailboxExportRequest -Mailbox $TargetUser -Filepath "$InPstPath$TargetUser.pst"
$objUser.Completed = "Yes"
$objUser.Date = $ShortDate
}
}
Remove-PSSession -Session (Get-PSSession)
I can't figure out a decent way to write back the $objUser.Completed and $objUser.Date values to the CSV.

Answer 1

Firstly, it's obvious but let me state it anyway. The very first time you run this script, $objUser.name, $objUser.Completed and $objUser.Date will not exist; So, the line
$TargetUser=$objUser.name
will not work, unless you actually have the structure in place in that csv (i.e. have the headers name,completed,date).
Now assuming you got that part done, all you have to do is to create an object that captures the state in an object and then write that back.
$Processed = foreach ($objUser in $In_List) {
if ($objUser.Completed -ne "Yes") {
$TargetUser = $objUser.name
$ShortDate = (Get-Date).toshortdatestring()
New-MailboxExportRequest -Mailbox $TargetUser -Filepath "$InPstPath$TargetUser.pst"
[PSCustomObject]#{Name=$objUser.name;Completed="Yes";Date=$ShortDate}
}
} else {
[PSCustomObject]#{Name=$objUser.name;Completed="No";Date=$null}
}
## export to a temp file
$Processed | export-csv -Path $env:TEMP\processed.csv
## You should probably check to see if original file was modified since you started working on it
# and copy over if not
Copy-Item $env:TEMP\processed.csv $OutPstPath'login.txt' -force