PowerShell - Get list of assemblies across servers, based on filters

This script can interrogate a list of servers for assemblies installed in the GAC, based on a filter or array of filters (using wildcards, if necessary). Returns as an array of objects, so output can be piped to csv using the | export-csv commandlet

NOTE: The script assumes that windows is installed in C:\Windows on each server - you may need to change this in the script i.e.

dir "\\$server\c$\windows\assembly\gac_msil"

replace with 

dir "\\$server\?$\windowsfolder?\assembly\gac_msil"

Script: check-assemblies.ps1

# Script to get assemblies from servers, and can be filtered for custom assemblies
# Params
# -ServerListFile : File containing a list of server names to check. One line per server. If not specified, local server will be checked
# -filters : filter or array of filters, to filter on dlls to be return. For example, I could use the filters "*chris*.dll","*Lawes*.dll"

param ($ServerListFile, $filters)

# Get server list, depending on params - if not used, just check the local server

if ($ServerListFile){
    $Servers = Get-Content $ServerListFile
}
else{

    $servers = $env:computername
}


foreach($server in $servers)
{
    foreach ($filter in $filters) { 
        dir "\\$server\c$\windows\assembly\gac_msil" -Recurse | where-object {$_.name -ilike $filter} | select @{n="Server";e={$server}}, Name, Length, LastwriteTime , @{n="Environment";e={$Environ}}
    }
}