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a simple text file with nothing but:
# /robots.txt file for http://www.example.com/
[edited by: WiseWebDude at 10:14 pm (utc) on Dec. 26, 2006]
disallowing Google to crawl a directory is not the solution for your "PR4 on all internal pages, but PR0 on the index page [webmasterworld.com]" problem.
Try to understand that first before taking any wild actions. This won't channel any PR to your main page.
one line in .htaccess:
Redirect permanent /olddirectory/oldfile.html http://www.example.com/newdirectory/newfile.html
of course, put your info in for the actual site, LOL.
[edited by: WiseWebDude at 9:04 pm (utc) on Dec. 28, 2006]