> Any suggestion?

There is no "better" answer to this question. You are advised to
read "The Unix and the Echo"[1], by Doug McIlroy,  and Russ Cox's
adaptation for our system, "The Plan 9 and the Echo"[2].

If you need different behavior than what's there, you want
something other than echo.

[1]	http://everything2.com/title/The+UNIX+and+the+Echo)
[2]	https://groups.google.com/forum/#!msg/comp.os.plan9/Bg-gyAzbWiE/VZj7qSVn5uIJ