Spinner for Shell commands

spinner.sh

#!/bin/bash

spinner() {
    local pid=$1
    local delay=0.1
    local spinstr="⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏"
    local i=0
    local len=${#spinstr}
    while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
        i=$(( (i+1) % len ))
        char=${spinstr:$i:1}
        printf "\r%s Executing long command..." "$char"
        sleep $delay
    done
    # Clear the entire line before printing "Done!"
    printf "\r%b" "                                                  "
    printf "\r"

}

# Usage example
long_command() {
    sleep 10
}

printf " Executing long command..."
long_command &
spinner $!
echo -e "\033[32m✓\033[0m Done!"