echo -e 'QUIT\n' | nc slartibartfast 110 +OK POP3 slartibartfast v7.59 server ready +OK Sayonara echo -e 'HELO sparrow.websense.net\nQUIT\n' | nc localhost 25 220 sparrow.websense.net ESMTP Sendmail 8.8.7/8.8.7; Tue, 14 Dec 1999 00:06:04 -0500 250 sparrow.websense.net Hello localhost [127.0.0.1], pleased to meet you 221 sparrow.websense.net closing connection echo -e 'GET / HTTP/1.0\n\n' | nc localhost 80 | less HTTP/1.1 200 OK telnet localhost 22 SSH-1.5-1.2.19