Powershell modify CSV - powershell

Question

I read a lot of questions here about this and i don't find what i search ...
I start scripting with powershell (just for information :p )
I want to modify a CSV file, exported from a database with information like "FirstName,LastName,OtherMail,IDAurion,Department". I have to add some titles to the HEADER, and i have to take informations in the CSV to concatenate some informations and put them in another CSV file.
I don't know if i explain well, i put you my script :
$OriginalCSV = "$PSScriptRoot\original.csv"
function Remove-StringLatinCharacters
{
PARAM ([string]$String)
[Text.Encoding]::ASCII.GetString([Text.Encoding]::GetEncoding("Cyrillic").GetBytes($String))
}
Import-Csv -path $OriginalCSV -Encoding Default | ForEach-Object {
$OtherMail = $_.OtherMail
$IDAurion = $_.IDAurion
$Department = $_.Department
$FirstnameCSV = $_.FirstName
$FirstName = $FirstnameCSV -replace '(^\s+|\s+$)',''
$FirstnameNoLatin = Remove-StringLatinCharacters $FirstName
$FirstnameNoLatinNoSpace = $FirstnameNoLatin -replace '\s','-'
$FirstnameFirstLetterUpper = $Firstname.Substring(0,1).ToUpper()
$LastNameCSV = $_.LastName
$LastName = $LastnameCSV -replace '(^\s+|\s+$)',''
$LastnameNoLatin = Remove-StringLatinCharacters $LastName
$LastnameNoLatinNoSpace = $LastnameNoLatin -replace '\s',''
$LastnameFirstLetterUpper = $Lastname.Substring(0,1).ToUpper()
$UserPrincipalNameCSV = $FirstnameCSV + "." + $LastNameCSV + "#campus.ocellia.fr"
$UserPrincipalNameConcatene = $FirstnameNoLatinNoSpace + "." + $LastNameNoLatinNoSpace + "#email.fr"
$UserPrincipalName = $UserPrincipalNameConcatene.ToLower()
$MailNickName = $FirstnameNoLatinNoSpace.substring(0,1).toupper() + $($FirstnameNoLatin.substring(1).tolower() -replace '\s','') + $LastnameNoLatinNoSpace.toupper()
$Password = $FirstnameFirstLetterUpper + $LastnameFirstLetterUpper + $IDAurion + "$"
$Number = 0
Get-Content $OriginalCSV |
ForEach-Object{
If($Number -eq 0){
$_ + ",MailNickName" + ",Password" + ",UserPrincipalName"
$Number = 1
}
Else {
$_ + "," + $MailNickName + "," + $Password + "," + $UserPrincipalName
}
} | Out-File $PSScriptRoot\Modified-CSV.csv
}
This work for 1 line, but not for multiples line ...
Edit :
This is the examples for input CSV and how i want the resulting output CSV:
Input csv :
Firstname,Lastname,OtherMail,ID,Department
Pierre,DUPONT,pierre.dupont#mail.com,123456,Paris
Marie,CHANTAL,marie.chantal#mail.com,456789,Marseille
Output csv:
Firstname,Lastname,OtherMail,ID,Department,MailNickName,Password,UserPrincipalName
Pierre,DUPONT,pierre.dupont#mail.com,123456,Paris,PierreDupont,PD123456,p.dupont#entreprise.com
Marie,CHANTAL,marie.chantal#mail.com,456789,Marseille,MarieCHANTAL,MC456789,m.chantal#entreprise.com

Answer 1

I'm guessing this is what you're trying to do but since we don't have a minimal reproducible example it's quite hard to tell. I also attempted to improve your code, there was a lot of redundancy.
$OriginalCSV = "$PSScriptRoot\original.csv"
$ModifiedCSV = "$PSScriptRoot\modified.csv"
$txtInfo = (Get-Culture).TextInfo
function Remove-StringLatinCharacters
{
PARAM ([string]$String)
[Text.Encoding]::ASCII.GetString([Text.Encoding]::GetEncoding("Cyrillic").GetBytes($String))
}
(Import-Csv -Path $OriginalCSV -Encoding Default | ForEach-Object {
$OtherMail = $_.OtherMail.Trim()
$IDAurion = $_.IDAurion.Trim()
$Department = $_.Department.Trim()
$FirstnameCSV = $_.FirstName.Trim()
$LastNameCSV = $_.LastName.Trim()
$firstName = (Remove-StringLatinCharacters $FirstName) -replace '\s','-'
$lastName = (Remove-StringLatinCharacters $LastName) -replace '\s'
$UserPrincipalName = "$FirstnameCSV.$LastNameCSV#campus.ocellia.fr"
$UserPrincipalNameConcat = "$firstName.$lastName#email.fr".ToLower()
$MailNickName = $txtInfo.ToTitleCase($firstName) + $lastName.ToUpper()
$Password = "{0}{1}$IDAurion$" -f $firstName.ToUpper()[0],$lastName.ToUpper()[0]
[pscustomobject]#{
FirstNameCSV = $FirstnameCSV
LastNameCSV = $LastNameCSV
OtherMail = $OtherMail
IDAurion = $IDAurion
Department = $Department
MailNickName = $MailNickName
Password = $Password
UserPrincipalNameCAMPUS = $UserPrincipalName
UserPrincipalNameEMAILFR = $UserPrincipalNameConcat
}
} | ConvertTo-Csv -NoTypeInformation) -replace '"' |
Out-File $ModifiedCSV