If it is necessary to convert to upper / lowercase all files in a certain directory, simply follow these steps:

  1. Navigate to the desired directory:
    cd /path/to/your/files
  2. Run the following command to convert to uppercase:
    for i in *; do mv $i `echo $i | tr [:lower:] [:upper:]`; done , or run the following command to convert to lowercase:
    for i in *; do mv $i `echo $i | tr [:upper:] [:lower:]`; done
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