phranque - 11:08 am on Jan 12, 2010 (gmt 0)

you would probably get a much better response if you did some work and posted questions in the appropriate forums.
you would also do well to try your questions in the search function on WebmasterWorld.
for example it you searched for " edit multiple files" you could have easily found the How to edit a bunch of static HTML files at once? [webmasterworld.com]thread.

i'll answer a coupel of others for you anyway:
- passwords should be encrypted before storage.
depending on your application and location there may be strict requirements regarding how to handle passwords.
- there are many "application frameworks" that simplify the interface between web pages and databases.
- the method for renaming files depends a lot on the operating system on which they reside.
- if you are into unix-type systems you can do some cool text processing with awk.
many scripting languages are well suited to manipulating text files, specifically perl.