[rychlik@ruby Mailer]$ exec 5</tmp/echo.output
[rychlik@ruby Mailer]$ read -u 5 HELLO
[rychlik@ruby Mailer]$ echo $HELLO
Hello
[rychlik@ruby Mailer]$ exec 5<>/dev/tcp/localhost.localdomain/25
[rychlik@ruby Mailer]$ read -u 5 REPLY
[rychlik@ruby Mailer]$ echo $REPLY
220 localhost.localdomain ESMTP Sendmail 8.13.1/8.13.1; Thu, 20 Jan 2005 11:59:47 -0700
[rychlik@ruby Mailer]$ echo -e "HELO boogy.com\n" >&5
[rychlik@ruby Mailer]$ read -u 5 REPLY
[rychlik@ruby Mailer]$ echo $REPLY
250 localhost.localdomain Hello localhost.localdomain [127.0.0.1], pleased to meet you
[rychlik@ruby Mailer]$