processbar

processbar.sh

echo -ne "-1\r"
sleep 1
echo -ne "--2\r"
sleep 1
echo -ne "---3\r"

readline.js

const readline = require('readline');
let count = 0;
function echo () {
  process.stdout.clearLine();
  process.stdout.cursorTo(0);
  process.stdout.write(count.toString()+'%')
  if(count> 99) return;
  count++;
  setTimeout(()=>{
    echo()
  }, 50)
}
echo();