[NTLUG:Discuss] NFS Resolution

[Greg Edwards]

Michael Patrick wrote:
> 
> Hi Patrick.
> 
> Unix permissions work like this:
> 
> 1 - execute (or traverse if a directory)
> 2 - write
> 4 - read
> 
> further.. the groupings are
> 
> owner group others
> 
> so 755 = rwxr-xr-x
> 
> Read/Write/Execute for owner
> Read and Execute for owner's groups and Others
> 


> 
> The utility to change permissions is chmod
> 
> chmod -R 755 michael.users testdir
> 
> means that I want to assign rwxr-xr-x to testdir AND everything below it  (-R is recurse)
> 
> Michael

Nice explanation Micheal.  Did you mean to put the "michael.users" in
that example?  The command line is "chmod [options] [modes] file..."
where file is multiple.

To add a simplicity when using chmod you can use the alpha characters to
set the modes.

rewritting the above example for testdir

chmod -R u=rwx,g=rx,o=rx testdir

This method has the advantage that only the class(es) included on the
command line get changed.  A second advantage is that by using a plus
(+) or minus (-) instead of the equal (=) you can change just the mode
for just the class you want changed.

chmod -R o-r testdir

will remove read permissions all the way down for other.

You can also use the special "a" class which means all.  This is a
shortcut if you want all classes to have the same access.

chmod -R a=rwx testdir

will give rwxrwxrwx to testdir and down.

-- 
Greg Edwards
New Age Software, Inc.
http://www.nas-inet.com