How to show and modify user info in Ubuntu server?

Question

If I want to put some personal information (like Full Name) to an account, how can I check it again? And how can I modify it?

On Ubuntu server. With command line only.

Answer 1

chfn is probably the easiest way to change the GECOS fields. I think on most systems normal users are restricted from changing the full name field by default, in which case you will have to do this as root:

sudo chfn -f 'New name' <user>

To see the fields just look at the /etc/passwd file, or use something like getent passwd $USER if you prefer to get the entire entry.