Rename files in a directory from upper to lowercase

rename_upper_lower.sh

#!/bin/bash

# Loop through all files in the directory
for file in *; do
  # Check if the file exists and is a regular file
  if [[ -f "$file" ]]; then
    # Convert the file name to lowercase
    lowercase_name=$(echo "$file" | tr '[:upper:]' '[:lower:]')

    # Rename the file to lowercase
    mv -i "$file" "$lowercase_name"
  fi
done