Set-acl

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

Syntax
      Set-Acl [-path] string[] [-aclObject] ObjectSecurity
                 [-filter string]
                    [-Include String] [-Exclude String]
                       [-passThru] [-whatIf] [-confirm] [CommonParameters]

Key
   -Path path
       Path to the item to be changed {accepts wildcards}

   -aclObject ObjectSecurity
       An ACL with the desired property values.

   -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 only works when the path includes a wildcard character.

   -exclude string
       Omit the specified items from the Path e.g. "*SS64*"
       this only works when the path includes a wildcard character.

   -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.

   CommonParameters:
      -Verbose, -Debug, -ErrorAction, -ErrorVariable, -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 $DogACL 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