differ

param (
    [Parameter(Mandatory=$true)]
    [String]
    $HostList,

    [Parameter(Mandatory=$true)]
    [String]
    $FilePath,

    [Parameter(Mandatory=$false)]
    [System.Management.Automation.PSCredential]
    $Credential
)

$ErrorActionPreference = "Stop"

if (!$Credential) {
    $Credential = Get-Credential
}

if (![System.IO.File]::Exists("$PSScriptRoot\$HostList")) {
    throw "Error. The file '$HostList' does not exist."
}

$results = @{
    "None" = @()
}

$contents = Get-Content "$PSScriptRoot\$HostList"
foreach ($line in $contents) {
    try {
        Write-Host ("{0}/{1}: Processing: {2}" -f $contents.IndexOf($line), $contents.Count, $line)
        $hash = Get-FileHash -Path ("\\{0}\{1}" -f $line, $FilePath)
        $results[$hash.Hash] += @($line)
    } catch {
        $results["None"] += $line
        Write-Error $_
    }
}

$results