@pitaj yes, exactly. I was trying to use that command in DO console.

I'm not a programmer. Can you please provide me link to resource in which we can find support to upgrade with my current system specifications?
OS: Ubuntu
Database: MongoDB
Hosted on DigitalOcean

I'm trying to upgrade NodeBB from v1.13.3 5 to v1.16.2. However, the commands provided in NodeBB official documentation do not seem to work. I get the following response
$: command not found

Can anybody tell me how to upgrade NodeBB if we are using Ubuntu on DigitalOcean?