how to use powershell 2.0 SET-ACL command

Set Access Control List permissions from on a file (or object).

Syntax
      Set-Acl [-path] string[] [-aclObject] ObjectSecurity
                 [-Include String] [-Exclude String]
                    [-filter string] [-passThru] [-whatIf]
                       [-confirm] [-UseTransaction] [CommonParameters]
 
Key
   -Path path
       Path to the item to be changed {accepts wildcards}

       If a security object is passed to Set-Acl (either via -AclObject 
       or by passing an object from Get-Acl), and -Path is omitted,
       Set-Acl will use the path that is included in the security object.

   -AclObject ObjectSecurity
       An ACL with the desired property values.
       Often the output of a Get-Acl command saved in a variable.

   -Filter string
       A filter in the provider's format or language. 
       The exact syntax of the filter (wildcard support etc) depends on the provider.
       Filters are more efficient than -include/-exclude, because the provider
       applies the filter when retrieving the objects, rather than having 
       PowerShell filter the objects after they are retrieved.

   -include string
       Include only the specified items from the Path. e.g. "May*"
       This qualifies the -Path parameter and normally includes a wildcard.
        
   -Exclude string
       Omit the specified items from the Path e.g. "*SS64*"
       This qualifies the -Path parameter and normally includes a wildcard.

   -PassThru 
       Pass the object created by Set-Acl through the pipeline.
  
   -WhatIf
       Describe what would happen if you executed the command without
       actually executing the command.

   -Confirm
       Prompt for confirmation before executing the command.

   -UseTransaction
       Include the command in the active transaction.

   CommonParameters:
       -Verbose, -Debug, -ErrorAction, -ErrorVariable, -WarningAction, -WarningVariable,
       -OutBuffer -OutVariable.

Examples

Copy the security settings from Dog.txt to Cat.txt

PS C:\> $DogACL = get-acl c:\dog.txt
PS C:\> set-acl -path C:\cat.txt -AclObject $DogACL

Or the same thing with a pipeline:

PS C:\> get-acl c:\dog.txt | set-acl -path C:\cat.txt

Apply the same $Dog ACL to all the files in C:\Temp\ and all of its subdirectories:

PS C:\> get-childitem c:\temp -recurse -force | set-acl -aclobject $DogACL -whatif