The && will cause the shell to wait before running the command after it, and should any of them fail, none of the ones after it will run. && is a conditional, it's not a background statement. Also, is there any particular reason that string of commands is all in one line? And what is 'echo exec' for, did you mean for that to be without the echo?
I don't think there's any point trying to open it as a FD in the shell if you're trying to save time, since the shell will wait for the reader to open the pipe anyway. Once it does, all three processes will get the same pipe, which I doubt is what you want. at which point all three processes will get copies of the
same pipe, not queue up.
This sort of code, on the other hand, will wait for the pipe, launch a process, then immediately wait on the pipe again without waiting for the launched process to finish:
Code:
echo a > fifo &
echo b > fifo &
echo c > fifo &
