function_countdown.sh

#!/bin/bash

# Random number between 1 and 10
WAIT=`shuf -i 1-10 -n 1`

# Subtract 1 from the random number, check if it is now 0
is_random_number_zero () {
  let WAIT=WAIT-1
  return $([[ "$WAIT" -eq "0" ]])
}

# Check if random number is 0 then sleep for 1 second, loop
until is_random_number_zero; do
    sleep 1s;
    echo $WAIT
done