countdown timer for bash #bash

timer.sh

#!/bin/bash

function timer() {
  if [[ $1 -lt 1 ]]; then
    cat <<EOF

  Usage: timer <seconds>

EOF
    return 1
  fi

  local n="$1"
  while [[ $n -gt 0 ]]; do
    printf "\r\033[0K==> $n"
    sleep 1
    ((n--))
  done
  printf "\r\a"
}