add more info for usage

windows/frd.ps1

@@ -1,13 +1,5 @@
 # Find and Remove Duplicates
 
-# This is the directory we'll check for duplicates
-# TODO: make this a parameter
-
-#$check_dir = "C:\Program Files\Microsoft Office\Updates\Download\PackageFiles"
-#$backup_dir = "C:\Users\richa\tmp\backups3"
-
-# = "C:\Program Files\Microsoft Office\Updates\Download\PackageFiles",
- # = "C:\Users\richa\tmp\backups3"
 param (
     [string]$check_dir,
 
@@ -21,12 +13,23 @@ param (
 function ShowUsage {
     $message = @"
 
-Find and Remove Duplicates usage:
+Find and Remove Duplicates usage: 
+
+** Use with caution **
+
     frd.ps1 -check_dir [-delete -backup_dir (backup location)] [-show_dups]
      -check_dir (where to look for duplicates)
      -backup_dir (location to backup files before deletion)
      -delete # will delete the duplicates
      -show_dups # will show the duplicates
+
+   ** A typical dirctory to check would be the Office downloads directory:
+   -check_dir 'C:\Program Files\Microsoft Office\Updates\Download\PackageFiles'
+
+   ** The backup directory can be any writable location, the destination directory is created:
+   -backup_dir 'C:\tmp\backups'
+
+   ** Files can only be deleted if you have the needed privledge
 "@      
 
     Write-Output $message