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How to change file names?

• To: mathgroup at smc.vnet.net
• Subject: [mg70819] How to change file names?
• From: "solidifire" <barabbasgospel at yahoo.com.tw>
• Date: Sat, 28 Oct 2006 05:22:06 -0400 (EDT)

There are n JPEG files, with file names f1, f2, ..., fn.
I want to change their names to, for example, g1, g2, ..., gn.
Of course the easiest way is to change file names by myself,
but this is not convenient when n is large.
How should I do by using Mathematica?
I tried:

Export["g1.jpg",
  Import["f1.jpg", "JPEG"], "JPEG"]

It does change the file name as I expect.
There is, however, a side effect:
somehow the file size in bytes of g1.jpg is one-tenth of that of
f1.jpg.
Besides, I have to read in the files and then write out the files
-- I don't think these two steps are really necessary,
because all I want to do is to change the file names.
Is there any better method?
Thank you in advance.

• Follow-Ups:
  • Re: How to change file names?
    • From: "Chris Chiasson" <chris@chiasson.name>
  • Re: How to change file names?
    • From: ggroup@sarj.ca