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    I think your actual usage of ssh must be more complicated than what you show as examples, because you can get the behavior you want with a simple rearrangement: sleep 1000 && ssh server "echo f" > foo (It has to be &&, not ;, so that killing sleep prevents the ssh command from running.) If I'm right, please make your examples more representative of your actual usage, so a better answer can be given. Commented Jun 4, 2012 at 21:31
  • Correct: sleep and echo are actually user supplied scripts and not literally sleep and echo. So we do not know what they do and should assume the worst. Commented Jun 4, 2012 at 22:05
  • Sooo...you're going to come up with a better example command, right? One where a simple rearrangement doesn't fix the problem? You ask a good question, and I'd like to see it answered, but you're less likely to get an answer if "so don't do that, then" is a reasonable reply. Commented Jun 4, 2012 at 22:56
  • Oh by the way... Don't do that ;) Commented Jun 4, 2012 at 23:08
  • As elabrated in the question: """In the above I use "sleep 1000;echo f", but in reality that is supplied by the user, thus it can contain anything""" Commented Jun 4, 2012 at 23:16