watch.sh: A simple script for getting up-to-date command output faster, without stdout flickering

watch.sh

#!/usr/bin/env zsh
set -eax
# Do not run this with untrusted argv!
# Usage Example: ./watch.sh curl -fsSL http://66117b5a7483e49ba3af.functions.localhost/log

A="$RANDOM"
B="$RANDOM"
while true; do
  A="$($@)";
  if [[ "$B" != "$A" ]]; then
    echo -e "\x1b[H\x1b[2J\x1b[3J$A";
    B="$A"
  fi;
  sleep "${INTERVAL:-0.2s}";
done