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SSH
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Escape Sequences
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~? (tilde question mark) displays the escape sequences.  Notably, ~. kills the
connection (eg, if the other end has hung), and ~^Z backgrounds the shell (so
you can mess around locally). 

``~/.ssh/config``
------------------------

To "reuse" a single SSH connection between multiple shells/pipes/scp::
    
    ControlPath ~/.ssh/master-%l-%r@%h:%p
    ControlMaster auto

Enable compression over remote connections with fast machines::

    Compression yes