I have two txt files. Both contain a list of usernames:
List 1:
user1
user2
user3
List 2:
user1
user2
user7
I want to compare these two lists. I want to know which users do not exist in both lists. So the output in this case should be a this list:
Endlist:
user3
user7
This is my code:
$list1 = get-content -Path "C:\list1.txt"
$list2 = get-content -Path "C:\list2.txt"
$endlist = foreach ($item in $list1)
{
if ($item -notmatch $list2)
{
[PSCustomObject]@{
Name = $item
}
}
$endlist |Out-file "C:\endlist.txt"
What am I doing wrong?
Normally you would use Compare-Object
for this:
$list1 = 'user1', 'user2', 'user3'
$list2 = 'user1', 'user2', 'user7'
(Compare-Object $list1 $list2).InputObject # => user3, user7
If you want to do the comparison manually, and since you want to know the objects unique to either list, you would need two loops and the use of a containment operator (-notin
or -notcontains
in this case):
$list1 = (Get-Content list1.txt).Trim()
$list2 = (Get-Content list2.txt).Trim()
& {
foreach($i in $list1) {
if($i -notin $list2) { $i }
}
foreach($i in $list2) {
if($i -notin $list1) { $i }
}
} | Out-File "endlist.txt"