The following should work (probably there are other ways as well).
process1 | tee >(process2) | process3

This splits the output of process1 to a named pipe which process2 uses as input and the anonymous pipe into process3.
process2 is in a sub-shell, so it's run in parallel with process3, which is run in parallel with process1 and tee because pipes always run in parallel.


leegold@speedymail.org wrote:
> Hi,
> 
> I want to do the following:
> 
> Btw, I don't know if & meaning I think run processes in background has
> any effect on my question but it's there w/the actual commands so I'm
> adding it. So one process runs and is piped into a second process.
> 
> $ process1 | process2 &
> 
> Is there a way I can pipe process1 into process3 (and still pipe into
> precess2) ? So process1 runs and process2 and process3 run in parallel
> both feed by process1. So like test.txt file w/content:
> 
> a
> 
> b
> 
> c
> 
> ---
> then
> 
> $ cat test.txt | grep a
> $ a
> $ cat test.txt | grep c
> $ c
> 
> I want cat test.text to feed both greps at the same time and maybe get
> output like:
> 
> $ac
> 
> I tried the tee command w/no luck. Is there a way to do this on one line
> at one time? Thanks. using Ubuntu w/Bash. 
> 
> Lee
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