Linux - change user/usergroup/hostname/etc...

RENAMING : USER ACCOUNT / USER DIRECTORY / UID / HOSTNAME


To avoid process-conflict when modifying a user, be sure that you're
signed out of the account you're intending to modify.



---[ step #1 ]-----------------------------------------------------

To create a new user:
	sudo adduser <username>
	*** enter a password when prompted ***

Make the account a super-user:
	sudo usermod -aG sudo <username>

---[ step #2 ]-----------------------------------------------------

Now login to the dummy account! When you get in, open up a terminal.

Rename the user account you want to change:
	sudo usermod -l <new_username> <username>

---[ step #3 ]-----------------------------------------------------

At this point, the user director (ex: /home/<username>) will also need
to be renamed to match the new username you've selected, else there will
be issues and all sorts of minor hang-ups.

You will want to copy the contents from the old user directory (including
desktop contents, documents, etc) over to the new one. To do this:
	sudo usermod -d /home/<new_username> -m <old_username>

	sudo ln -s /home/<new_username> /home/<old_username>

---[ step #4 ]-----------------------------------------------------

You finally need to shift the user-group from the old username to the
new one. You can do this by:
	sudo groupmod -n <new_username> <old_username>

---[ step #5 ]-----------------------------------------------------

You may also want to set a new user-ID for the new username.
Do this by doing:
	sudo usermod -u <uid> <new_username>

---[ step #6 ]-----------------------------------------------------

If you want to change the hostname (computer name) of the machine.

Enter in this statement to see the current hostname:
	cat /etc/hostname

To change it:
	hostnamectl set-hostname <new_hostname>

You will also want to check the hosts file:
	cat /etc/hosts

Modify the line "127.0.1.1 <old_hostname>" and change that too:
	sudo mousepad /etc/hosts

	*** change the hostname manually***

---[ step #7 ]-----------------------------------------------------

Finally, you may choose to get rid of the dummy user you've used
to make changes to the original user account:

	sudo userdel <username>



References:
	https://www.youtube.com/watch?v=-nHmA75AcTM
	https://www.serverlab.ca/tutorials/linux/administration-linux/how-to-rename-linux-users-and-their-home-directory/
	https://www.youtube.com/watch?v=-nHmA75AcTM


Note: Nautilus file explorer may not want to re-pin directories such as Documents, Music, and Videos
      on the left-hand side. To re-pin, manually navigate to the desired directory and hit CTRL + D to
      pin.