const { Client } = require('ssh2');
const c = new Client();
c.on('ready', () => {
  const cmd = [
    "echo '=== LAST 200 LINES server-out.log ==='",
    "tail -200 /var/log/bigwo/server-out.log",
    "echo ''",
    "echo '=== LAST 50 LINES server-error.log ==='",
    "tail -50 /var/log/bigwo/server-error.log 2>/dev/null || echo 'no error log'",
  ].join(' && ');
  c.exec(cmd, (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' });