Powershell Network Scan - Script

Here's the code/script for network scan I was talking about in previous post here

function HandleShare
{
 $share = $args[0];
 write-host ***Scanning Share $share
 #write-host net use X: $share 
 $erroractionpreference = "SilentlyContinue";
 $files = Get-ChildItem -recurse -name $share $fileType 
 $erroractionpreference = "Continue";

 foreach($file in $files)
 {
  if($file.length -gt 0)
  {
   $filepath = $share + "\" + $file;
   write-host $filepath
  }
 }

}

function HandleHost 
{
 $hostname = $args[0];
 $hostname = $hostname.substring(0, $hostname.indexof(" "))
 #write-host "***Scanning Host " + $hostname;

 #List shares.
 $shares = net view $hostname | findstr " Disk" 
 foreach($share in $shares)
 {
  if($share.length -gt 0)
  {
   $tmp = $share.substring(0, $share.indexof("Disk"));
   $tmp = $tmp.Trim();
   $tmp = $hostname + "\" + $tmp;
   HandleShare $tmp;
  }
 }
}

function DisplayUsage
{
 write-host
 write-host -foregroundcolor green "Usage:"
 write-host -foregroundcolor green "       scan.ps1 fileType maxNoOfMachines"
 write-host -foregroundcolor green "       e.g. scan.ps1 *.txt 10"
 write-host
}

function Main
{
 $hostnames = net view | findstr "\\";
 foreach($hostname in $hostnames)
 {
  $maxNoOfMachines = $maxNoOfMachines - 1;
  if($maxNoOfMachines -lt 0)
  {
   exit;
  }

  HandleHost $hostname;
 }
}

#
# Initialise
#

#Guard against un initialised variables. aka, typos
set-psdebug –strict

#using $fluff as i dint like LoadWithPartialName o/p somethign to console.
$fluff = [reflection.assembly]::LoadWithPartialName("'Microsoft.VisualBasic")

#
# Validate input paramters
#
if($args.count -lt 2 -or $args.count -gt 2)
{
 DisplayUsage;
 exit;
}
if(-not([Microsoft.VisualBasic.Information]::isnumeric($args[1])))
{
 DisplayUsage;
 write-host -foregroundcolor Red "Error:"
 write-host -foregroundcolor Red "       Second paramter should be numeric."
 write-host
 exit;
}

#
# Convert args into variables which are used through out this script.
#

$maxNoOfMachines = $args[1];
$fileType = $args[0]; #Global variable used in HandleShare.
#$maxNoOfMachines = 30;  #Global variable used in Main.

#
# Start actual work
#

Main;