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The ssh_config file.

Working in an environment with hundreds of SSH servers, one appreciates the value a good ssh_config file.  I use an ssh_config file to specify specific usernames for certain hosts, as well as specifying a keepalive interval, to prevent my session from timing out.

I use the following options:

Host hostname

HostName hostname (can be an IP)

User username

ServerAliveInterval 60 (sends keepalive every 60 seconds)

For further info check out the good old man ssh_config.