[powershell] How to list AD group membership for AD users using input list?

I'm fairly new PS user... Looking for some assistance with a powershell script to obtain list of security groups user is member of.

To describe what I need:

• I have input list (txt file) with many users (samaccountnames). Every name is on a new line.
• I need the script to search these names in AD - whole forest, not just one single domain
• output should look like "samaccountname" and list of groups this account is member of in one line, so I can sort it in excel

This is the script I have:

$users = Get-Content C:\users.txt

ForEach ($User in $users) {
  $getmembership = Get-ADUser $User.Users -Properties MemberOf | Select -ExpandProperty memberof
  $getmembership | Out-File -Append c:\membership.txt 
}

but it throws me an error:

Get-ADUser : Cannot validate argument on parameter 'Identity'. The argument is null. Supply a non-null argument and try the command again.
At line:4 char:28
+ $getmembership = Get-ADUser <<<<  $User.Users -Properties MemberOf | Select -ExpandProperty memberof
    + CategoryInfo          : InvalidData: (:) [Get-ADUser], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.ActiveDirectory.Management.Commands.GetADUser

Anyway, this script wouldn't search the whole forest.

Sample input list:

username1
username2
username3
username4... etc

Sample output list

username1;group1;group2;group3
username2;group1;group2;group3;group4... etc or something similar

Any help would be greatly appreciated.

Or add "sort name" to list alphabetically

Get-ADPrincipalGroupMembership username | select name | sort name

Get-ADPrincipalGroupMembership username | select name

Got it from another answer but the script works magic. :)

Everything in one line:

get-aduser -filter * -Properties memberof | select name, @{ l="GroupMembership"; e={$_.memberof  -join ";"  } } | export-csv membership.csv

The below code will return username group membership using the samaccountname. You can modify it to get input from a file or change the query to get accounts with non expiring passwords etc

$location = "c:\temp\Peace2.txt"
$users = (get-aduser -filter *).samaccountname
$le = $users.length
for($i = 0; $i -lt $le; $i++){
  $output = (get-aduser $users[$i] | Get-ADPrincipalGroupMembership).name
  $users[$i] + " " + $output 
  $z =  $users[$i] + " " + $output 
  add-content $location $z
}

Sample Output:

Administrator Domain Users Administrators Schema Admins Enterprise Admins Domain Admins Group Policy Creator Owners
Guest Domain Guests Guests
krbtgt Domain Users Denied RODC Password Replication Group
Redacted Domain Users CompanyUsers Production
Redacted Domain Users CompanyUsers Production
Redacted Domain Users CompanyUsers Production