Simple script to spin the terminal cursor in various ways.

spin.sh

#!/bin/sh

# Note:
# https://en.wikipedia.org/wiki/ANSI_escape_code
# https://www.fileformat.info/info/unicode/block/block_elements/list.htm

function spin {
	CHRS=$1
	DELAY=$2
	X=0;

	trap "printf '\033[?25h'; exit" 2
	printf '\033[?25l'

	while true; do
		X=$(((X+1)%${#CHRS}))
		#printf '%s\033[1D' "${CHRS:$X:1}"
		printf '%s\b' "${CHRS:$X:1}"
		sleep $DELAY
	done
}

ASCII='-\|/'
BLOCKWISE='▖▘▝▗'
FADE=' ░▒▓█▓▒░'
FISHTAIL=' ▖▌▙█▜▐▝'
GROWXSHRINKX=' ▏▎▍▌▋▊▉█▉▊▋▌▍▎▏'
GROWXSHRINKY=' ▏▎▍▌▋▊▉█▇▆▅▄▃▂▁'
GROWYSHRINKY=' ▁▂▃▄▅▆▇█▇▆▅▄▃▂▁'

spin "$BLOCKWISE" 0.1333