Feature request: fsh-like functionality

Norbert Nemec Norbert.Nemec.List at gmx.de
Thu Jul 22 20:58:43 EST 2010

I have recently found the "fsh" program (http://www.lysator.liu.se/fsh/) which offered exactly what I needed. It is a great program but it is not maintained and was even thrown out of Debian because it was claimed that OpenSSH provided anything FSH offers. In fact, however, I miss a few features in OpenSSH that could easily be added inspired by FSH and make a very valuable addition in general:

* Fast remote command execution
    Current timings:
       ssh otherhost echo hi  -> 1.06 sec  # regular connection
       ssh -f -N -M                        # setting up master
       ssh otherhost echo hi  -> 0.86 sec  # using master
       fsh otherhost echo hi  -> 2.06 sec  # this sets up the master
       fsh otherhost echo hi  -> 0.096 sec # this uses the master
    Is there any fundamental reason for the 0.86 sec delay in a slave connection? After all - fsh demonstrates that the same thing can be done in less than 0.1 sec. This makes a significant difference for the applications that I have in mind.

* Automatic generation of *persistent* master connections
    At the moment the "ControlMaster auto" setting creates a master when a regular ssh command is issued, but this master is closed when the command finishes. There should be an option that creates a master automatically when needed but leaves it alive for subsequent remote commands.

* Timeout of persistent master connections
    When master connections are created on-the-fly, they should also timeout after a certain period of idleness.

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