Loading animation in shell script

loading.sh

#! /bin/bash

LOADING=("\\" "|" "/" "-")

loading() {
  printf "%s \b\b" ${LOADING[$(( $1 % 4 ))]}
}

# Usage
: << "END"

i=0

while :
do
  if [[ finish statement ]]; then
    echo " "
    break
  fi

  loading $1

  (( i += 1 ))
  sleep 1s
done

END