What directories does user own - LTS 12.04

Question

Which directories in the hierarchy does the default main user (UID 1000) own? like maybe /usr/share/ or /bin/ I need to now exactly the directories my user needs to own in the hierarchy, in short I made a mistake, details here:

12.04 LTS won't boot after modifying root directory permissions

And specifically which files handle the sudo command, as when I try to use it from tty it reports an error, sudo: need to be root to perform operation

Answer 1

CD to the directory you want to search and use the find program:

find -uid 1000

You can find out any user ID with id:

id <username>

On my system (12.04) the sudo program is at /usr/bin/sudo and has the "Set UID" bit (permissions -rwsr-xr-x). This command might fix it, if you run it as root:

 chmod u+s /usr/bin/sudo

Every user should own just their home directory, with everything else being owned by root. One exception is files inside /tmp, which are owned by the user that created them. However, /tmp itself is owned by root, but is writable by anyone (permissions 777).

The other exception is files inside /proc, but the contents of this directory are created by the kernel and you don't need to alter the permissions of anything inside.

To fix permissions, boot into recovery mode, CD to /, and run:

chown root:root -R *

Then CD to /home and fix each home directory:

 chown <user>:<user> -R <home_dir>