A simple Bash script that renames all .png files in the current directory using randomly generated lowercase UUIDs. It ensures uuidgen is installed before execution and skips renaming if no PNG files are found.

#!/bin/bash

# Check if 'uuidgen' command is available
if ! command -v uuidgen &> /dev/null; then
  echo "uuidgen command not found. Please install it first."
  exit 1
fi

# Loop through all .png files in the current directory
for file in *.png; do
  # Skip if no PNG files found
  if [ ! -e "$file" ]; then
    echo "No PNG files found in the current directory."
    exit 0
  fi

  # Generate a random UUID v4 and convert to lowercase
  uuid=$(uuidgen | tr '[:upper:]' '[:lower:]')

  # Rename the file
  mv "$file" "${uuid}.png"
done

echo "All PNG files have been renamed to random lowercase UUIDs."