how to connect to specific database instance

I have an Oracle 8i database. There are two database instances on the system called k5ent1 and k5ent2. I want to run a sql script on k5ent2. How do I make sure once I open up sqlplus that I'm viewing the right database? When I type connect I just type in my username and password. It never asks for specifics.

Tried connect username/password_at_machine_name:1521:k5ent2 but it didn't seem to like that format.

Thanks.

Steve
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