Powershell: Merge multiple lines into one - powershell

Question

I have a .csv file which looks like:
employeenumber;phone;mobile;fax;userid;Email
99999991;[phone];[phone];[phone];user01;user1#domain.com
99999992;[phone];[phone];;user02;user2#domain.com
99999993;[phone];[phone];;user03;user3#domain.com
99999993;[phone];;;user03;user3#domain.com
99999993;;;[phone];user03;user3#domain.com
99999994;[phone];;;user04;user4#domain.com
As you can see there are different employeenumbers and some lines with the same employeenumber.
Is there any way to merge the lines with the same employeenumber in powershell?
Similar Output:
employeenumber;phone;mobile;fax;userid;Email
99999991;[phone];[phone];[phone];user01;user1#domain.com
99999992;[phone];[phone];;user2;user2#domain.com
99999993;[phone] / [phone];[phone];[phone];user03;user3#domain.com
99999994;[phone];;;user04;user4#domain.com
Thank you

Answer 1

I've taken a shot at it. I believe my answer is easier to read than Mjolinor's.
I group the entries from the CSV into either $singletons or $duplicates, based on using the Group-Object command. Then, I pipe through the $duplicates and merge the records found in either the phone,mobile, or fax fields, using a '/' character as you've indicated.
#$csv = get-content .\CSVNeedstoMerge.csv
$csvValues = $csv | ConvertFrom-Csv -Delimiter ';'
$duplicates = $csvValues | group-object EmployeeNumber | ? Count -gt 1
$objs = New-Object System.Collections.ArrayList
$singletons = $csvValues | group-object EmployeeNumber | ? Count -eq 1 | % {$objs.Add($_.Group)}
ForEach ($duplicate in $duplicates){
$objs.Add([pscustomobject]#{employeenumber=($duplicate.Group.employeenumber | select -Unique) -as [int];
phone=($duplicate.Group.phone | ? Length -gt 0) -join '/';
mobile=($duplicate.Group.mobile| ? Length -gt 0) -join '/';
fax=($duplicate.Group.fax | ? Length -gt 0) -join '/';
userid = $duplicate.Group.userid | select -Unique
email= $duplicate.Group.email | select -Unique })
}
$objs | Sort EmployeeNumber

Answer 2

I'll give that a shot:
(#'
employeenumber;phone;mobile;fax;userid;Email
99999991;[phone];[phone];[phone];user01;user1#domain.com
99999992;[phone];[phone];;user02;user2#domain.com
99999993;[phone];[phone];;user03;user3#domain.com
99999993;[phone];;;user03;user3#domain.com
99999993;;;[phone];user03;user3#domain.com
99999994;[phone];;;user04;user4#domain.com
'#).split("`n") |
foreach {$_.trim()} | sc test.csv
$ht = #{}
$props = (Get-Content test.csv -TotalCount 1).split(';')
import-csv test.csv -Delimiter ';' |
foreach {
if ( $ht.ContainsKey($_.employeenumber) )
{
foreach ($prop in $props )
{
if ($_.$prop )
{$ht[$_.employeenumber].$prop = $_.$prop }
}
}
else { $ht[$_.employeenumber] = $_ }
}
$ht.values | sort employeenumber
employeenumber : 99999991
phone : [phone]
mobile : [phone]
fax : [phone]
userid : user01
Email : user1#domain.com
employeenumber : 99999992
phone : [phone]
mobile : [phone]
fax :
userid : user02
Email : user2#domain.com
employeenumber : 99999993
phone : [phone]
mobile : [phone]
fax : [phone]
userid : user03
Email : user3#domain.com
employeenumber : 99999994
phone : [phone]
mobile :
fax :
userid : user04
Email : user4#domain.com