Basic CLI loading animation

loading.sh

#!/usr/bin/env bash

for i in {0..12}; do
  if ! (($i % 4)); then
    printf "\e[1K\rloading"
  else
    printf "."
  fi
  sleep 1
done && printf "\e[2K\r"

The terminal escapes are the interesting part.

\033[1K or \e[1K will clear from the cursor position to the beginning of the line.
\033[2K or \e[2K will clear everything on the line.