reverse-tee, or, merging stdout's

[Jim Balter]

In article <1991Apr19.182517.199 at rathe.cs.umn.edu> ian at rathe.cs.umn.edu (Ian Hogg) writes:
>  Maybe this will work:
>
>  prog1 arg1 arg2 | (cat ; prog2 arg3 arg4 arg5) | prog3

and maybe it won't.  If you have doubts, why not try it before posting?

What will work are

   prog1 arg1 arg2 | (cat - ; prog2 arg3 arg4 arg5) | prog3

and

   ( prog1 arg1 arg2 ; prog2 arg3 arg4 arg5) | prog3