First, you need to SSH into your NAS.
When you are in your NAS with the user you want the ID for, just type id and hit Enter.
Now you'll get something like this:
uid=1031(your_nas_user) gid=100(users) groups=100(users), 101(administrators)
From that, you can read your UID is 1031, user group...
In DSM go to Control Panel > Terminal & SNMP > Terminal tab
Check Enable SSH service and set your port (it is strongly recommended not to use port 22, but to change it to something else).
Open Terminal (Mac) (on Windows machine open CMD (Command Prompt) or PuTTY program for instance) and...
I just notice I cannot change vi color scheme ( :colorscheme ... only default) , while ssh into SynoNAS via Ubuntu within Windows 10.
can anyone help, where are the color scheme and even if I could install/restore them or update vi in SynoNAS?