UNIX question: switching instances

I'm a VAX bigot trying to learn UNIX and am having fits.

The UNIX environment that I have set up has more that one instance, and I want to make it easy for people to switch from one to another. Since we are running under the C-shell, I know that they could do this:

% source /opt/bin/coraenv

ORACLE_SID [dev]:

What I want to be able to do is to set up a command that accepts the SID name as a parameter and switches it for them.

% inst dev

However, if I create a script file to do this, any changes made to ORACLE_SID seem to only be in effect while I'm in the script. When I exit back out, ORACLE_SID is unchanged.

The contents of inst look something like this:

setenv ORACLE_SID $1
senenv ORAENV_ASK no
source /opt/bin/coraenv

Any suggestions? How do the rest of you unix people have people switch from one instance to another?

Bob

-- 
Bob Swisshelm                | swisshelm_at_Lilly.com     | 317 276 5472
Eli Lilly and Company        | Lilly Corporate Center  | Indianapolis, IN 46285