some chmod worries !

From: grid (prohit99_at_gmail.com)
Date: 12/14/04 

Date: Tue, 14 Dec 2004 10:27:10 +0530

Hi,
   I have used chmod many times for changing permissions, but never have
come across these following chmod statements.

1. chmod 4544 - I supposed chmod only changes a 3 digit number.

2. chmod a+r

3. chmod s+u - Thought this should be suid related , but we specify
either (o)wner/(g)roup/(a)all first and then add the permissions.

4. chown nobody - Chown changes the owner of the file.But when do we
need to do this ? what are the permissions for nobody, and is the
permissions same on all OS's ( UNIX) ?

Regards,
Rohitash

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