THIS IS A DRAFT.  Updates may still happen



Using ls -l, explain the different file and directory permissions
displayed. The owner/user, group, and other permissions should 
be clearly understood.


Setup the following:

* We have the following users:
** user1, user2, user3, .... user9

* We have the following groups:
** even, odd, staff, users, webmasters


* All users are in the "users" group.




File and Directory Permissions have 1 view and 2 ways to Set
Fill in the octal permissions for the following:

* drwxrwxrwx
* -rwxrwxrwx
* drwxr-xr-x
* -rw-r--r--
* -rw-rw----
* -rw-r-----
* -rwxr-xr-x
* -rwxr--r--
* -rwxr-----
* drwxr-x---
* drwx------

For the above examples, please fill in the symbolic modes.
Multiple modes may be needed. How is that done?



Simple File and Directory Permissions - what do these translate 
into from an ls -l listing?

440
660
775
750
What symbolic modes would be used to make equivalent permissions?


Personal files and directories - what do these translate 
into from an ls -l listing?

400
600
700
What symbolic modes would be used to make equivalent permissions?


Umask - what do these translate into from an ls -l listing?
When is the only time that umask matters? pg 45

0022
0002
0077
0027


What does 'umask -S' do?


What is the best way to change your umask forever?

How would you change your umask temporarily?


Execute File Permissions

u+x
g+x
o+x
o-x


Execute Directory Permissions

u+x
g+x
o+x
g-x
o-x
go=x
a+x




Set and Retain eXecute Permissions

+x vs +X


Why would drwx--x--x be useful?


Why bother with octal?
* chmod u=rw,go=r file 
* chmod 644 file



What are ACLs?


Where might they be useful?


Are ACLs always available to be used?


What would be bad about using ACLs?


Are there clients that ignore ACLs? What are the ramifications?


Set Uid/Gid Permissions on files/programs/scripts. Why?

Setgid on Directories. Why?


Create a directory to be shared by all members of the "even" group.
Explain the detailed permissions for owner, group, and access modes
needed.


What is the "sticky bit" and when is it used?


Explain what file attributes are and when they might be useful.


If a web-server runs using the 'wsrv' user account, setup file and
directory permissions to allow the group 'webmaster' to maintain the
files in /var/www/lpi.jdpfu.com/ . 
What should be the ownership, group
and permissions so that no new subdirectories can be created by anyone
other than root.

Create subdirectories for the website:
* Info
* About
* Purchase
* Contact
Allow any members of the group to modify any files inside them, except
the "About" subdirectory. That should be 'immutable'.  What commands were
run?





Command Summary

-   chmod (only the owner/root)
-   ls -al
-   chgrp (only the owner/root)
-   chown (only root can do this)
-   getfacl
-   setfacl
-   lsattr
-   chattr

End 


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