progress.sh

#!/usr/bin/env bash

counter=1
echo "demo: error state"
while [ $counter -le 25 ]; do
  printf "\x1b]9;4;2;${counter}\x07"
  ((counter++))
  sleep 0.1
done
echo "demo: normal state"
while [ $counter -le 50 ]; do
  printf "\x1b]9;4;1;${counter}\x07"
  ((counter++))
  sleep 0.1
done
echo "demo: pulsing"
while [ $counter -le 75 ]; do
  printf "\x1b]9;4;3\x07"
  ((counter++))
  sleep 0.1
done
echo "demo: normal state"
while [ $counter -le 100 ]; do
  printf "\x1b]9;4;1;${counter}\x07"
  ((counter++))
  sleep 0.1
done
printf "\x1b]9;4;0\x07"