[ubuntu] How to rename multiple files.

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http://ubuntuforums.org – Hi, I dont know how rename multiple files at the same time. I try several program but thats not work for me because the files I have to rename are emails in .eml format and all the emails dont have the same name so I cannot put things on the fields ''change that'' for ''that''. For the command, I dont understand the rename command for Linux. I need help please because I dont know what do with that. Thanks you in advance! Guillaume (Hardware)