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lang-bash
bash,<( somecomand )redirects the output to a file descriptor, so it can be used in place of a file.sleepdoes not produce any output.sleepdoesn't produce any output, I only used it to have some time to have a look at the file descriptors associated to the different processes. I then realized I could usereadinstead in order to "block" the execution of the command in the background while looking into the/proc/<PID>directories.sleepstill inherits an stdout file descriptor from its parent, and the fact that it doesn't print anything isn't really relevant to how the plumbing is set up. (Consider that the program inside could be something likefind, which may or may not print something.)