tst.sh

#!/bin/sh

  W= C=8192K

  printf "\n\nNull:\n\n"
  time dd if=/dev/zero count=${C} >/dev/null

  printf "\n\nPipe:\n\n"
  time dd if=/dev/zero count=${C} | cat >/dev/null

  nc -l -p 2000 localhost >/dev/null & W=${!} ; sleep 1
  printf "\n\nPipe + IP-Socket:\n\n"
  time {
    dd if=/dev/zero count=${C} | nc -q0 localhost 2000 ; wait ${W}
  }

  cat </dev/ptya0 >/dev/null & W=${!} ; sleep 1
  printf "\n\nBSD-PTY:\n\n"
  time { dd if=/dev/zero count=${C} >/dev/ttya0 ; wait ${W} ; }

exit # tst