macos - OS X / Linux: pipe into two processes?

Question

I know about

program1 | program2

and

program1 | tee outputfile | program2

but is there a way to feed program1's output into both program2 and program3?

Answer 1

You can do this with tee and process substitution.

program1 | tee >(program2) >(program3)

The output of program1 will be piped to whatever is inside ( ), in this case program2 and program3.