shell - How to rename files without changing extension in Linux 102221.pdf to 102221_name.pdf -

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How to rename files without changing the extension in Linux <10 p>

102221.pdf I think 102221_name.pdf

This is what you want me to think: 

 `Ls` for  x MV $ x $ {x% *} _ Name. $ {X ## *.};

$ {x% } will name the file without extension - $ {x ## }.


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