You can use ssed for pipe STDOUT of any command-line program to SSE clients.

How to install ssed?

$ go get github.com/mesuutt/ssed

Usage

You can pipe STDOUT of any command-line program to ssed for send output of the program to the SSE clients:

$ ./printEverySecond.sh | ssed
Reading from STDIN
Listening on  localhost:3000

You can use ssed with named pipes too:

cat <> myfifo | ssed &
echo 'text' > myfifo

Also you can send messages to SSE clients with a prompt with starting ssed with -p argument:

$ ssed -p
Listening on  localhost:3000
(1 clients)-> hello
Sent message: hello
(1 clients)-> how are you?
Sent message: how are you?

$ ssed -h
Usage of ssed:
  -v    Verbose debug messages
  -l string
        Listening address and port (default "localhost:3000")
  -p    Show prompt for message which send to clients