"When using multiple systems the indispensable tool is, as we
all know, ssh. Using ssh you can login to other (remote) systems
and work with them as if you were sitting in front of them. Even if
some of your systems exist behind firewalls you can still get to
them with ssh, but getting there can end up requiring a number of
command line options and the more systems you have the more
difficult it gets to remember them. However, you don't have to
remember them, at least not more than once: you can just enter them
into ssh's config file and be done with it.
"For example, let's say that you have two "servers" that you
connect to regularly, one at your house that's behind your
firewall. Further, let's say that you use dyndns to make your home
IP address known, and that you've got ssh listening on port 12022
rather than the default port 22 (and you've got your firewall
forwarding that port to the server). So to connect you need to
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