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Contents 1 User Administration 1.1 How to set/change/enable root user password 1.2 How to disable root user account 1.3 How to allow root user to login into GNOME 1.4 How to switch to root user in Console mode 1.5 How to add/edit/delete system users 1.6 How to add/edit/delete system groups 1.7 How to automatic login into GNOME (not secure) 1.8 How to allow more sudoers 1.9 How to use "sudo" without prompt for password (not secure) 1.10 How to explicitly destroy the "sudo" session 1.11 How to change files/folders permissions 1.12 How to change files/folders ownership 1.13 How to change files/folders group ownership

User Administration

How to set/change/enable root user password

• Read #General Notes

sudo passwd root

How to disable root user account

• Read #General Notes

sudo passwd -l root

How to allow root user to login into GNOME

• Read #General Notes
• Read #How to set/change/enable root user password
• System -> Administration -> Login Window
• Login Windows Preferences

Security Tab -> Security -> Allow local system administrator login (Checked)

How to switch to root user in Console mode

• Read #General Notes

sudo -s -H
Password: <specify user password>

How to add/edit/delete system users

• Read #General Notes
• System -> Administration -> Users and Groups
• Users and Groups

Users Tab -> Add User.../Properties/Delete

or

sudo useradd jim
sudo userdel jim

• For more info read

man usermod

How to add/edit/delete system groups

• Read #General Notes
• System -> Administration -> Users and Groups
• Users and Groups

Groups Tab -> Add Group.../Properties/Delete

How to automatic login into GNOME (not secure)

• Read #General Notes
• System -> Administration -> Login Window

Security Tab -> Enable Automatic Login (Checked)
Now choose a user from the drop-down menu.

How to allow more sudoers

• Read #General Notes

EDITOR=gedit sudo visudo

• Append the following line at the end of file

system_username	ALL=(ALL) ALL

• Save the edited file

OR since everyone in the admin group can use sudo:

sudo adduser a_username admin

This appends the admin group to the user's supplementary group list. They will now have sudo access.

How to use "sudo" without prompt for password (not secure)

• Read #General Notes

EDITOR=gedit sudo visudo

• Add the following line at the end of the file:

username	ALL=(ALL) NOPASSWD: ALL

• Save the edited file

How to explicitly destroy the "sudo" session

• Read #General Notes

sudo -K

How to change files/folders permissions

• Read #General Notes

Right click on files/folders -> Properties

Permissions Tab -> Read/Write/Execute (Checked the permissions for Owner/Group/Others)

How to change files/folders ownership

• Read #General Notes

sudo chown system_username /location_of_files_or_folders

If you want to change ownership of all containing files and folders recursively, use the -R option like this:

sudo chown -R system_username /location_of_files_or_folders

How to change files/folders group ownership

• Read #General Notes

sudo chgrp system_groupname /location_of_files_or_folders

If you want to change group ownership of all containing files and folders recursively, use the -R option like this:

sudo chgrp -R system_username /location_of_files_or_folders