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If rename creates the name of a file which already exists then the file will be overwritten, so you can end up with fewer files than you started with.
The detox command line utility supplied with some linux distributions can recursively replace spaces with '_' and also remove other characters which might cause problems in file and folder names; it won't overwrite a file that already exists.
More details, and detox, can be obtained from http://detox.sourceforge.net/
thankyou to all who've responded here. this will take me
some time to sort through. been out of town the past few
days. frankly, i'm astonished at the amount of response
this question has produced.
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