file permissions - some basic info 

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PROBLEM:   A user in one "GROUP" "owns" a file, but it needs to be accessed
		by a user from an-"other" "GROUP".

SOLUTION:
		The "OWNER" of the file changes the permissions on the file
to permit "OTHER" users to access the file.  Once the changes have been made,
the "OWNER" of the file may modify the permissions back to the original
state to maintain file integrity and security.

EXAMPLE:
		a file owned by bsmith needs to shared by tjones.  tjones is in
	a different "group", so the file permissions must be opened up for all.

	FILE before chmod:
	=====================

-rw-rw-r--   1 6676       cadds       451690 Mar 19  1999 jg2020dt.2.h 

	EXECUTE THE FOLLOWING COMMAND:
	=================================
chmod 666  jg2020dt.2.h


	FILE after chmod:
	=====================

-rw-rw-rw-   1 6676       cadds       451690 Mar 19  1999 jg2020dt.2.h 



EXPLANATION OF FILE PERMISSIONS and other info provided by an "ls -al" command:
===================================================================================

-rw-rw-r--   1 6676       cadds       451690 Mar 19  1999 jg2020dt.2.h 
PERMISSSIONS 
	  LINKS
		 UID or owner
				GROUP  size   date year    filename

(note:  if the owner of the file is no longer on the system the file owner
will appear as the UID (user id) number instead of the name)

TO READ PERMISSIONS:
=====================
OWNER
    GROUP
	  OTHER
421 421 421
rwx rwx rwx

rw- rw- r--    - this would be 664  readable by all, but writtable by owner
and group.

(the x indicates executable and is not needed for normal files.)
More information on files will be found in tutorials on
http://www.wagoneers.com/UNIX


BASIC information on UNIX file directory listing:
======================================================================
A listing of files in a typical UNIX directory will look like this:

 >--> ll
total 58
drwxr-xr-x   6 john   sysadmin      1024 May 20  1999 .
drwxrwxr-x   5 john   sysadmin      1024 Aug  3 09:23 ..
drwxr-xr-x   2 john   sysadmin      1024 May 20  1999 BAK_info
-rw-r--r--   1 john   sysadmin        94 May 20  1999 aliases
-rw-r--r--   1 john   sysadmin      1512 May 20  1999 checklist.workstation
-rw-r--r--   1 john   sysadmin      1368 May 20  1999 hosts.980223
drwxr-xr-x   2 john   sysadmin      1024 May 20  1999 hp-base
-rwxr--r--   1 john   sysadmin      7985 May 20  1999 hp-config
-rw-r--r--   1 john   sysadmin      1021 May 20  1999 profile
-rw-r--r--   1 john   sysadmin      8511 May 20  1999 profile.980406

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MORE COMING....  
   to be continued...