rename

#!/bin/bash
# chmod +x this_script.sh
# usage: ./this_script *.txt
for name in "$@"; do
  new=$(sed -r 's/^[^0-9]+/xxx/' <<<"${name}")
  if [[ -e "${new}" ]]; then
    echo "$0: ${new} already exists." >&2
    continue
  fi
  # remove 'echo' --> rename actually
  echo mv -v "${name}" "${new}"
done