a little help with removing spaces from filenames

[technomage]

ok,
I've read and I've read, but can't seem to come up with a solution that isn't 
overly complex.
I want t take spaces in filenames and rename them with underscores "_" and 
would like to do so a directory at a time if need be.

any help would be appreciated

Technomage

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My life is my own - No. 6