SSH login with private keys

[askerc]

Hello
i need help logging in through the console on the server.
My colleague put linix server and handle authentication through public and private keys.
Now I got the private key in the form of key_id_rsa

How do I use it to log on the server with mac terminal?
Which command should I use?

I used to do it with Putty on Win, but now I dont have Win anymore.

thanks

 

[MacsWork]

ssh -i /path/to/rsa/key user@host

If key is on method of authentication user:host not required.