rolling longcat. mattn/longcat must be installed: https://github.com/mattn/longcat

rollingcat.sh

#!/bin/bash
# usage: ./rollingcat.sh INTERVAL TIMES
# mattn/longcat must be installed: https://github.com/mattn/longcat

if [[ $1 =~ ^[0-9]+(\.[0-9]+)?$ ]]; then
  interval=$1
else
  interval=1
fi

if [[ -n $2 ]] && [[ $2 =~ ^[0-9]+$ ]]; then
  count=$2
else
  count=1
fi

# hide cursor with CSI sequence
echo "\x1b[?25l"

for _ in $(seq ${count})
do
  for command in "longcat" "longcat -H" "longcat -R -r" "longcat -H -R -r"
  do
    lc=$(bash -c "${command}" 2>&1)
    clear
    echo ${lc};
    sleep ${interval};
  done
done

# show cursor with CSI sequence
echo "\x1b[?25h";