How things could be solved...

Exercise 3

Assignment 3.1

I'll set sticky bit for 'kompost' + generic permissions otherwise:

drwxrwx--T    3 root	 zelenina     1024 Apr  1 00:00
/home/zahrada/kompost

Assignment 3.2

The directory needs set-gid bit, so that group 'zelenina' would be inherited also for created files and subdirectories:
```
drwxrws---    2 root     zelenina     1024 Apr  1 00:00 /home/zahrada
```
'Mrkva' and 'kapusta' should set umask 007, which assures, that files and directories created by them will have fill rights. Alternatively, it is possible to set this system-wide -- the easiest way to do that is to properly modify /etc/profile.

Assignment 3.3

I know how to create an user, don't I? ;)
In his home directory I'll create hardlink to 'foliovnik': ln /home/zahrada/foliovnik /home/hrach/moj_foliovnik

Assignment 3.4

Create symbolic links: ln -s /home/zahrada /home/mrkva/z

Assignment 3.5

Just execute mkfifo /home/zahrada/hadica and we have a new pipe!

Assignment 3.6

In short, I'll just have a look around and see, what I will see. From interesting files we have e.g. /proc/cpuinfo or directories like /proc/<pid of process>.