Powershell: Recursively Replace String in Select Sub-files of a Directory

Question

I'm using Powershell on Windows XP and am trying to write a command that will:

1. read all .bat,.cfg, and .config files
2. replace a string (it's actually the path...these files were all moved)
3. overwrite the existing files with the new one (same name, same location, etc.)

I am not a Powershell user, but I have managed to piecemeal the following together:

gci -r -include "*.bat","*.config","*.cfg" 
    | gc 
    | foreach { $_ -replace "D:","C:\path" } 
    | sc ??.FullName

I'm fairly certain that I've taken care of #1 and #2, but am having trouble figuring out #3 (passing the filename to variable that can be referenced in sc). Any thoughts? Also, let me know if you need any additional information.

EDIT:

I managed to work out an answer (see below), but is there a better way to do this?

Answer 1

try:

gci -r -include "*.bat","*.config","*.cfg" |
 foreach-object { $a = $_.fullname; ( get-content $a ) |
 foreach-object { $_ -replace "D:","C:\path" }  | 
set-content $a }

Answer 2

If you want to use the above code on ALL FILES use this code, note the top line:

gci -r *.* |
foreach-object { $a = $_.fullname; ( get-content $a ) |
foreach-object { $_ -replace "master81","master" }  | 
set-content $a }

if you leave out *.* you may get errors because you are trying to edit folders.

[Get-Content], UnauthorizedAccessException