How to avoid echo closing FIFO named pipes? – Funny behavior of Unix FIFOs

Question

Put all the statements you want to output to the fifo in the same subshell:

# Create pipe and start reader.
mkfifo pipe
cat pipe &
# Write to pipe.
(
  echo one
  echo two
) >pipe

If you have some more complexity, you can open the pipe for writing:

# Create pipe and start reader.
mkfifo pipe
cat pipe &
# Open pipe for writing.
exec 3>pipe
echo one >&3
echo two >&3
# Close pipe.
exec 3>&-