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object --+ | executable.Executable --+ | executable.TimeoutExecutable --+ | executable.RedirectedExecutable --+ | Host.Executable
An 'Executable' is a simple redirected executable. The standard error and standard output streams are combined into a single stream. The standard input is not closed before invoking the program because SSH hangs if its standard input is closed before it is invoked. For example, running: ssh machine echo hi <&- will hang with some versions of SSH.
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Return a pipe to which to redirect the standard input. returns -- A pipe, or 'None'. If 'None' is returned, but '_StdoutPipe' returns a pipe, then the standard error and standard input will both be redirected to that pipe. However, if '_StdoutPipe' also returns 'None', then the standard error will be closed in the child.
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