#!/bin/bash

chars="/-|"

while :; do
  for (( i=0; i<${#chars}; i++ )); do
    sleep 0.5
    echo -en "${chars:$i:1}" "r"
  done
done

#!/usr/bin/env bash

spinner() {
    local i sp n
    sp='/-|'
    n=${#sp}
    printf ' '
    while sleep 0.1; do
        printf "%sb" "${sp:i++%n:1}"
    done
}

printf 'Doing important work '
spinner &

sleep 10  # sleeping for 10 seconds is important work

kill "$!" # kill the spinner
printf 'n'

set -l symbols ◷ ◶ ◵ ◴
while sleep 0.5
    echo -e -n "b$symbols[1]"
    set -l symbols $symbols[2..-1] $symbols[1]
end