Hi Friends
You can follow this one for granting all permission of one user to another.
GRANT ALL ON <TABLE-NAME> TO <USER-NAME> [WITH GRANT OPTION]
ALL used to specify all of the object privilegs such as
ALTER DELETE INDEX UPDATE INSERT and SELECT
ON <TABLE-NAME> Specifies the table view or synonyms
TO <USER-NAME> Specifies to whom the privileges are granted
WITH GRANT OPTION Specifies that the grantee may pass on the privileges
that has been granted to another user.
I think that this is helpful