screenshot.sh

#!/usr/bin/env bash
# dependencies:
# - imagemagick
# - xdotool

function screenshot() {
  local timestamp=$(date "+%Y-%m-%d_%H-%M-%S")
  local path="$HOME/Pictures/screenshot_${timestamp}.png"
  for i in $(seq 5); do echo "$(printf '%0.s·' $(seq $i))" && sleep 1; done &&
    import -window "$(xdotool getwindowfocus -f)" "${path}"
  echo "Screenshot path: ${path}"
}

# output
# ·
# ··
# ···
# ····
# ·····
# Screenshot path: <$HOME>/Pictures/screenshot_<$timestamp>.png
# NB you can get focused on any window while program runs to make screenshot