Tiny Core Linux

Tiny Core Base => Raspberry Pi => Topic started by: onelife on September 24, 2021, 11:25:50 AM

Title: Correct method to change tc user to own user without adding another account?
Post by: onelife on September 24, 2021, 11:25:50 AM

Hi there,

Previously I have added another user to TC so as to be the user I require for my app. However, this seems a bit unnecessary as I don't need the default tc user and I would just like to change that user - But besides the boot option that only changes the prompt to "user"@tc - what would be the best / correct way to keep only 1 user for the system BUT change that user from tc > xyz.

The change would be all aspects, home folder, profile, bashrc, passwd, groups etc - those are the files that after adding my "xyz" user I normally then edit so as to give my new user "xyz" all the same access as the default tc user.

Really think I might be missing something as an easy way to just change the name of the current default user?

Many Thanks

Title: Re: Correct method to change tc user to own user without adding another account?
Post by: Rich on September 24, 2021, 01:41:30 PM

Hi onelife
To remove a user, you can try:

Code: [Select]

sudo deluser tc
If you want the users home directory removed as well:

Code: [Select]

sudo deluser --remove-home tc

Title: Re: Correct method to change tc user to own user without adding another account?
Post by: curaga on September 25, 2021, 02:24:34 AM

That's exactly what the boot option is for? It does not just change the prompt.

Title: Re: Correct method to change tc user to own user without adding another account?
Post by: KeithA on January 25, 2023, 08:52:35 AM

I don't think this and the related topic: http://forum.tinycorelinux.net/index.php/topic,23605.msg148094.html (http://forum.tinycorelinux.net/index.php/topic,23605.msg148094.html) have yet been fully answered.

Ignoring the restriction of not adding another user I've been looking at how to change tc to a user of choice and have a solution.
In the example here the user of choice is admin. This is a summary.

On a uSD card freshly imaged with PiCore 13.1.0 add user=admin to Boot partition cmdline.txt ensuring a Unix line ending of LF. I used Notepad++.

Insert card into Pi and power on. I used an SSH connection.

Login as tc, password piCore

If you view the sudoers file with:
 sudo cat /etc/sudoers
The last two lines read:
tc      ALL=NOPASSWD: ALL
admin   ALL=NOPASSWD: ALL

You can see admin has the same sudo privileges as tc

If you view user account information with:
 cat /etc/passwd
There is an entry for tc
tc:x:1001:50:Linux User,,,:/home/tc:/bin/sh

But no entry for admin which is why you can't log in as admin

If you view the group account information with:
 cat /etc/group

There is an entry
staff:x:50:

tc's gid is 50 which is staff

Now have enough information to create user account admin:
 sudo adduser -G staff admin
Enter password twice

Login as admin:
 login admin
Enter admin password

Remove user tc:
 sudo deluser --remove-home tc

Get the response:
deluser: can't find tc in /etc/group

However if you view the group account information you will see that tc is no longer a user.

Very Important!
Save and reboot:
 filetool.sh -b
 sudo reboot

Finished

After preparing the uSD card, the entire session for making the change is shown here:

login as: tc
tc@192.168.1.106's password:
   ( '>')
  /) TC (\   Core is distributed with ABSOLUTELY NO WARRANTY.
 (/-_--_-\)           www.tinycorelinux.net

tc@box:~$ sudo adduser -G staff admin
Changing password for admin
New password:
Retype password:
passwd: password for admin changed by root

tc@box:~$ login admin
Password:
   ( '>')
  /) TC (\   Core is distributed with ABSOLUTELY NO WARRANTY.
 (/-_--_-\)           www.tinycorelinux.net

admin@box:~$ sudo deluser --remove-home tc
deluser: can't find tc in /etc/group