spinner.sh

#!/bin/bash

function print_spinner {
    for item in "$@"
    do        
        echo -n "$item"  # Print without newline.
        sleep 0.2  # Wait 0.2 seconds.
        echo -ne "\b"  # Erase previous character.
    done
}

items=('|' '/' '-' '\')

while true  # Infinite loop.
do
    print_spinner "${items[@]}" 
done