String find and replace

[hokiegal99]

John Roth wrote:
> Are you trying to rename the file? Look under os - Files and Directories
> for the rename() function. It's 6.1.4 in the 2.2.3 docs.
> 
> John Roth

No, I'm trying to find 'this' in files and replace it with 'that' 
recursively through a directory. It works, but it doesn't actually 
commit the change to the files, it finds 'this' and reports that it 
replaced it with 'that', but when I run the scipt again it reports the 
same files that it just fixed.