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Top Forums Shell Programming and Scripting shell script/telnet - Remove/Control "Connection closed by foreign host" Post 302399479 by alister on Sunday 28th of February 2010 10:56:40 AM
Old 02-28-2010
Hi, phpfreak:

Telnet is probably spitting that out to standard error, which isn't caught by command substitutions and in your code isn't redirected nor piped. Try redirecting telnet's stderr to /dev/null.

Code:
telnet $1 80 2>/dev/null

If not for this script then for the future, it would likely benefit you to learn more about netcat (aka nc).

Regards,
Alister
 

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telnetrc(4)							   File Formats 						       telnetrc(4)

NAME
telnetrc - file for telnet default options DESCRIPTION
The .telnetrc file contains commands that are executed when a connection is established on a per-host basis. Each line in the file con- tains a host name, one or more spaces or tabs, and a telnet(1) command. The host name, DEFAULT, matches all hosts. Lines beginning with the pound sign (#) are interpreted as comments and therefore ignored. telnet(1) commands are case-insensitive to the contents of the .telnetrc file. The .telnetrc file is retrieved from each user's HOME directory. EXAMPLES
Example 1: A sample file. In the following example, a .telnetrc file executes the telnet(1) command, toggle: weirdhost toggle crmod # Always export $PRINTER DEFAULT environ export PRINTER The lines in this file indicate that the toggle argument crmod, whose default value is "off" (or FALSE), should be enabled when connecting to the system weirdhost. In addition, the value of the environment variable PRINTER should be exported to all systems. In this case, the DEFAULT keyword is used in place of the host name. FILES
$HOME/.telnetrc SEE ALSO
telnet(1), in.telnetd(1M), environ(5) SunOS 5.10 9 Jan 1998 telnetrc(4)
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