Can I grant permissions to specific set of uids (linux) ?

[David Gauthier <davegauthierpg@xxxxxxxxx>]

Hi:

I'd like to grant select, insert, update, delete to a table for a specific set of uids (linux).  All others get select only.  Can the DB authenticate the current linux user and grant access based on the fact that they are logged in ()IOW, no passwords ?    Is this possible ? If so, how ?

Thanks for any help