Check if a value exists in one csv file and add static text to another csv field with Powershell - powershell

Question

I need to check if the column value from the first csv file, exists in any of the three other csv files and return a value into a new csv file, in order of precedence.So if the username field from allStaff.csv exists in the list of usernames in the sessionVPNct.csv file, put the static text into the final csv file as 'VPN'. If it does not exist, check the next csv file: sessionCRXct.csv then put the static text 'CRX', if not check the last csv file: sessionTMSct.csv then put the static text: TM if not the put the static text 'none' into the final csv file.
I have four csv files as below:
1. allStaff.csv
2. VPN.csv
3. CRX.csv
4. TMS.csv
I have imported the csv files into variables as below:
$allUsers = Import-Csv -Path "C:\allStaff.csv"
$vpn = Import-Csv -Path "C:\VPN.csv" | Select-Object -ExpandProperty UserName
$crx = Import-Csv -Path "C:\CRX.csv" | Select-Object -ExpandProperty UserName
$tms = Import-Csv -Path "C:\TMS.csv" | Select-Object -ExpandProperty UserName
The $allUsers variable displays the following:
Firstname LastName Username Position Area
--------- -------- -------- -------- ----
Joe Bloggs jbloggs Gardener Maintenance
Jim Smith jsmith Accountant Finance
Bob Seger bseger HR Advisor Human Resources
Adam Boson aboson Customer Support IT
Adele bree abree Payroll Finance
The $vpn variable displays the following:
Username
--------
jbloggs
jsmith
The $crx variable displays the following:
Username
--------
jbloggs
jsmith
bseger
The $tms variable displays the following:
Username
--------
jbloggs
jsmith
bseger
aboson
Then I have the following line to start the result csv file
$result = $allUsers | Select-Object *,ConnectionMethod
Not quite sure how to do the final query, which I believe should be an if else loop to go through all rows in the $result variable, and check the other csv if the username field exists, then return the static text.
$result | Export-Csv -Path "C:\allStaffConnections.csv"
This is how I need the final allStaffConnections.csv file to be displayed.
Firstname LastName Username Position Area ConnectionMethod
--------- -------- -------- -------- ---- --------------
Joe Bloggs jbloggs Gardener Maintenance VPN
Jim Smith jsmith Accountant Finance VPN
Bob Seger bseger HR Advisor Human Resources CRX
Adam Boson aboson Customer Support IT TMS
Adele bree abree Payroll Finance none
Am I on the right track with the below code?
$allUsers = Import-Csv -Path "C:\allStaff.csv"
$vpn = Import-Csv -Path "C:\VPN.csv" | Select-Object -ExpandProperty UserName
$crx = Import-Csv -Path "C:\CRX.csv" | Select-Object -ExpandProperty UserName
$tms = Import-Csv -Path "C:\TMS.csv" | Select-Object -ExpandProperty UserName
$vpnText = 'VPN'
$crxText = 'CRX'
$txsText = 'TMS'
$noneText = 'none'
$allUsersExtended = $allUsers | Select-Object *,ConnectionMethod
$results = $allUsersExtended.ForEach(
{
if($vpn -Contains $PSItem.UserName) {
# add $vpnText to ConnectionMethod column for that row in the $result
$PSItem.ConnectionMethod = $vpnText
}elseif($crx -Contains $PSItem.UserName) {
# add $crxText to ConnectionMethod column for that row in the $result
$PSItem.ConnectionMethod = $crxText
}elseif($tms -Contains $PSItem.UserName) {
# add $txsText to ConnectionMethod column for that row in the $result
$PSItem.ConnectionMethod = $tmsText
}else {
# add $noneText to ConnectionMethod column for that row in the $result
$PSItem.ConnectionMethod = $noteText
}
})
$results | Export-Csv -Path "C:\allStaffConnections.csv" -NoTypeInformation
This gives me an empty allStaffConnections.csv file.
I have run the code line by line and can get as far as:
$allUsersExtended = $allUsers | Select-Object *,ConnectionMethod
Which gives me the extra column "ConnectionMethod", but after running the loop, it gives me an empty allStaffConnections.csv file.

Answer 1

here is one way to do the job. [grin] it presumes that you only want to 1st connection type found. if you want all of them [for instance, JBloggs has all 3 types listed], you will need to concatenate them.
what it does ...
fakes reading in the CSV files
when ready to use real data, comment out or remove the entire #region/#endregion section and use Get-Content.
iterates thru the main collection
uses a switch to test for membership in each connection type list
this breaks out of the switch when it finds a match since it presumes you only want the 1st match. if you want all of them, then you will need to accumulate them instead of breaking out of the switch block.
sets the $ConnectionType as appropriate
builds a PSCO with all the wanted props
this likely could be shortened by using Select-Object, a wildcard property selector, and a calculated property.
sends it out to the $Results collection
shows it on screen
saves it to a CSV file
the code ...
#region >>> fake reading in CSV files
# in real life, use Import-CSV
$AllUsers = #'
FirstName, LastName, UserName, Position, Area
Joe, Bloggs, jbloggs, Gardener, Maintenance
Jim, Smith, jsmith, Accountant, Finance
Bob, Seger, bseger, HR Advisor, Human Resources
Adam, Boson, aboson, Customer Support, IT
Adele, bree, abree, Payroll, Finance
'# | ConvertFrom-Csv
$Vpn = #'
UserName
jbloggs
jsmith
'# | ConvertFrom-Csv
$Crx = #'
UserName
jbloggs
jsmith
bseger
'# | ConvertFrom-Csv
$Tms = #'
UserName
jbloggs
jsmith
bseger
aboson
'# | ConvertFrom-Csv
#endregion >>> fake reading in CSV files
$Results = foreach ($AU_Item in $AllUsers)
{
# this presumes you want only the 1st connection type found
# if you want all of them, then you will need to concatenate them
switch ($AU_Item.UserName)
{
{$_ -in $Vpn.UserName}
{
$ConnectionType = 'VPN'
break
}
{$_ -in $Crx.UserName}
{
$ConnectionType = 'CRX'
break
}
{$_ -in $Tms.UserName}
{
$ConnectionType = 'TMS'
break
}
default
{
$ConnectionType = 'None'
}
}
[PSCustomObject]#{
FirstName = $AU_Item.FirstName
LastName = $AU_Item.LastName
UserName = $AU_Item.UserName
Position = $AU_Item.Position
Area = $AU_Item.Area
ConnectionTYpe = $ConnectionType
}
}
# on screen
$Results
# send to CSV
$Results |
Export-Csv -LiteralPath "$env:TEMP\brokencrow_-_UserConnectionType.csv" -NoTypeInformation
truncated on screen output ...
FirstName : Joe
LastName : Bloggs
UserName : jbloggs
Position : Gardener
Area : Maintenance
ConnectionTYpe : VPN
[*...snip...*]
FirstName : Adele
LastName : bree
UserName : abree
Position : Payroll
Area : Finance
ConnectionTYpe : None
the CSV file content from brokencrow_-_UserConnectionType.csv ...
"FirstName","LastName","UserName","Position","Area","ConnectionTYpe"
"Joe","Bloggs","jbloggs","Gardener","Maintenance","VPN"
"Jim","Smith","jsmith","Accountant","Finance","VPN"
"Bob","Seger","bseger","HR Advisor","Human Resources","CRX"
"Adam","Boson","aboson","Customer Support","IT","TMS"
"Adele","bree","abree","Payroll","Finance","None"