Q: start ontape -c as non-dba

Hy out there, my question in detail is : In our company we have a group of people who are responsible for the productivity-process of our applications, which means that they check that the database is online, the programs are running etc. The real dba's don't want them to have access to the shell and login as a informix dba, but everything I tried to prevent it failed. Here's what i tried: 1) chmod 6775 ontape didn't work, because the message "must be dba ..." comes up. I thought ontape would run under the file-owner id "informix" which has dba privileges !? 2) login through a script using expect didn't work because after the command "su informix" another subshell is started, which is not controlled by the script anymore I know that there is a possibility to administer special informix users with some privileges (f.e. start ontape), but I would prefer solution 1). Any ideas ??? Thanks in advance