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This tutorial explains how to rename all files in a directory and its subdirectories. Or just how to rename multiple files at once in Linux.

This can be done with one very simple command:

rename some other `find . -name '.*'`

This will replaces all occurences of 'some' in file names with 'other'.

A simple example: rename all htm files to html.

rename htm html `find . -name '*.html'`

The rename command takes 3 arguments:

1. thing to replace
2. thing to replace it with
3. a list of files to apply it to

Sources:
http://mamchenkov.net/wordpress/2005/09/26/recursively-renaming-files-in...
http://linux.die.net/man/1/rename