Simple spinner for Bash

bash_spinner.sh

#!/bin/bash

spinner()
{
	local phrase="Doing stuff..."
	local pid=$1
	local delay=0.5        # Adjust spinner speed
	local spinstr='|/-\'   # Spinner sequence
	while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
		local temp=${spinstr#?}
		printf " %s [%c] " "$phrase" "$spinstr"
		local spinstr=$temp${spinstr%"$temp"}
		printf "\r"
		sleep $delay
	done
    printf "\n"     # remove this if you want to delete "phrase" when action is complete
    printf "\r"
}

(
    # ... perform action here ...
    sleep 10
) &
spinner $!