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Top Forums UNIX for Dummies Questions & Answers Odd quirk with xargs and telnet Post 302458378 by Corona688 on Thursday 30th of September 2010 02:33:59 PM
Old 09-30-2010
It's because, when run with xargs, the commands have no standard input connected. Usually it'd wait for input, either from your end or the other end, but now it connects, tries to read from the keyboard, gets EOF, and quits instantly instead.

You can get around this by giving xargs a file listing arguments instead of reading them from stdin, i.e. list-servers > filename ; xargs -a filename command but it still requires stdin to be something terminal-like, meaning, it'd break down again if you tried to run this from a cron job instead of a terminal. 'telnet' may not be the best command for this, you might want to investigate netcat(nc)
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mconnect(1)							   User Commands						       mconnect(1)

NAME
mconnect - connect to SMTP mail server socket SYNOPSIS
mconnect [-p port] [-r] [hostname] DESCRIPTION
The mconnect utility opens a connection to the mail server on a given host, so that it can be tested independently of all other mail soft- ware. If no host is given, the connection is made to the local host. Servers expect to speak the Simple Mail Transfer Protocol (SMTP) on this connection. Exit by typing the quit command. Typing EOF sends an end of file to the server. An interrupt closes the connection immedi- ately and exits. OPTIONS
The following options are supported: -p port Specify the port number instead of the default SMTP port (number 25) as the next argument. -r "Raw" mode: disable the default line buffering and input handling. This produces an effect similar to telnet(1) to port number 25. OPERANDS
The following operand is supported: hostname The name of a given host. USAGE
The mconnect command is IPv6-enabled. See ip6(7P). FILES
/etc/mail/sendmail.hf help file for SMTP commands ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
telnet(1), sendmail(1M), attributes(5), ip6(7P) Postel, Jonathan B., RFC 821, Simple Mail Transfer Protocol, Information Sciences Institute, University of Southern California, August 1982. SunOS 5.10 9 Nov 1999 mconnect(1)
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