How to get all groups that a user is a member of?

Get-ADGroupbyUser.ps1

# Set the username for which to fetch the groups
# Usage: Get-memberOf-User.ps1 <username>
param (
    [string]$username
)

# If no username is provided, prompt the user for input
if (-not $username) {
    Write-Host "Please provide a username as an argument."
    exit
}


# Get the directory of the currently running script
$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path

# Set the output file path for CSV (same directory as script)
$outputPath_csv = Join-Path $scriptDir "output.csv"

# Get the user with their MemberOf attribute (groups)
$user = Get-ADUser -Identity $username -Properties MemberOf

# Extract the group names from the MemberOf attribute
$groupNames = $user.MemberOf | ForEach-Object {
    # Extract just the group name from the Distinguished Name (DN)
    (Get-ADGroup $_).Name
}

# Print the user and their groups to the console
Write-Host "User: $($user.SamAccountName)"
Write-Host "Groups:"

# Print each group name in a new line in the console
$groupNames | ForEach-Object { Write-Host $_ }

# If you want to display them in a single line (comma separated)
# Write-Host "Groups: $($groupNames -join ', ')"

# Prepare data to export to CSV
$exportData = [PSCustomObject]@{
    UserName   = $user.SamAccountName
    FirstName  = $user.GivenName
    LastName   = $user.Surname
    Email      = $user.EmailAddress
    Groups     = ($groupNames -join ", ")  # Join group names into a single string
}

# Export the data to CSV
$exportData | Export-Csv -Path $outputPath_csv -NoTypeInformation

# Output the location of the exported CSV file
# Write-Host "Exported user and groups to $outputPath_csv"