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How to rename a file or directory in ubuntu from terminal

There is no rename function in Ubuntu Linux.
Instead, you simply move the file, giving it a new name. If you don’t actually mv it to another directory, then you have effectively renamed it:
mv filename_original filename_new
If you are trying to rename a directory, you need to use the -r recursive flag:
mv -r original_directoryname new_directoryname


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