Is there a tool I can use that can create an entry for me in the tnsnames.ora for a catalog db.

for example: I want to use this type of syntax:

rman TARGET SYS/oracle@trgt CATALOG rman/cat@catdb

How do I create the catdb alais or can somebody provide me with an
example of what it looks like so I can plug it into my tnsnames.ora file
and edit it accordingly.

I am using oracle 10.2 on Solaris is that makes a difference.

Thanks to all who answer this post