[Bug 3175] ssh_config(5) - ProxyCommand should explain semantics

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3175

--- Comment #2 from frederik-openssh at ofb.net ---
Thank you. Second attempt

    ProxyCommand
             Specifies the command to use to connect to the server. If
             this option is provided then ssh(1) will not use the
             command line arguments such as "destination" and "-p
             port" for connecting. Instead, ssh(1) will run the given
             command, and will attempt to communicate with the remote
             server via the input and output of the command's process.
             Thus, specifying no proxy command (the default) would be
             semantically equivalent to `ProxyCommand="nc %h %p"`.
             ("nc" is the "netcat" utility, and %h and %p are expanded
             to host and port as defined under TOKENS below)

             The command string extends to the end of the line. The
             command is executed using the user's shell `exec'
             directive to avoid a lingering shell process. [...]

There is a bit of repetition in the next paragraph ("Arguments to
ProxyCommand accept the tokens [...]") but I think this is OK. (?)

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