admin/sudo confusion

[Toshi Esumi]

On Sun, 2013-05-12 at 21:52 +0300, Catalin Soare wrote:
> ... I have no idea how group membership takes effect in the *nix
> world.

Group is simple with Unix/Linux. Below is my test file under my home
directory. Group name is currently same as owner name "toshi" but
they're different. And the file can be r(ead) or w(rite) by owner
"toshi" and all members of the group "toshi" 
toshi at ubuntu12-10:~$ ls -l test.file
-rw-rw-r-- 1 toshi toshi 5 May 12 20:56 test.file

if you want to change it, you can use like:
toshi at ubuntu12-10:~$ chmod 750 test.file
toshi at ubuntu12-10:~$ ls -l test.file
-rwxr-x--- 1 toshi toshi 5 May 12 20:56 test.file

Now owner can do read or write or (e)x(ecute), but group members can
only read or execute the file. They can't modify it.

Toshi

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