const { Client } = require('ssh2');
const c = new Client();
c.on('ready', () => {
  c.exec('grep -E "sendGreeting|replayGreeting|upstream ready|greeting|readySent" /var/log/bigwo/server-out.log | tail -30', (err, s) => {
    if (err) { console.error(err); c.end(); return; }
    let o = '';
    s.on('data', (d) => (o += d));
    s.stderr.on('data', (d) => (o += d));
    s.on('close', () => { console.log(o); c.end(); });
  });
}).connect({ host: '119.45.10.34', port: 22, username: 'root', password: '#xyzh%CS#2512@28' });