How to multiple rename with bash

Sorry the wiseman, I can't remember that guy who post this knowledge. ( he 's alway great ). 

 In your command line ( bash ) do

 $ for file_name in *.; do mv $file_name ${file_name//}; done;

 for example

 $ for f in *.sql; do mv $f ${f/.sql/.dump}; done;

 Then every sql files in your current folder will be .dump files hahaha :)

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