#!/usr/bin/env bash

cols=$(tput cols) line=""

while (( ${#line} < cols + ${#1} )); do
  if (( ${#line} < ${#1} )); then
    line=${1:$((${#1}-${#line}-1)):1}$line
  else
    line=" $line"
  fi

  sleep 0.2
  printf "\r%s" "${line:0:$cols}"
done

printf "\n"