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Top Forums Shell Programming and Scripting ENTER for modem configuration via telnet Post 302671605 by mrsbellamy on Friday 13th of July 2012 05:36:06 PM
Old 07-13-2012
ENTER for modem configuration via telnet

Hiya,

I'm trying to write a shell script to enter a bunch of loooooong configuration commands (to set ip, gateway etc.) for a quite outdated modem. It must be accessed via telnet. Here the preliminary code:
Code:
#!/bin/bash          
(echo "open 192.168.1.254"; sleep 10 
echo "Administrator"; sleep 3 
echo "modem command 1"; sleep 2
echo "modem command 2"; sleep 2
 ) | telnet

After the "open" command, I am asked a user name which is "Administrator", upon which I enter the modem terminal and have to put some 20 large commands ("modem command x") followed by ENTER. I can get as far as the modem terminal, but then the script just put the sequence of commands without ENTER:
Code:
Username : Administrator
 {Administrator}=>modem command 1  modem command 2   modem command 3

A solution to a similar problem in this forum suggests to put "\r" in the script to simulate the ENTER key but in my case this would just add a plain "r" to the command line.

I would also be happy about a solution which allows to press the ENTER key manually during sleep time (if I do this now, it would just make a new line...)

I'm a scripting noob and also not too knowledgable about telnet so please bear with me Smilie thx in advance for any hint!

PS. I read about the EXPECT package but it's no option since a want to have a code that runs on various machines without prerequisites.
 

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WEDGED(8)						      System Manager's Manual							 WEDGED(8)

NAME
wedged - HylaFAX modem wedged script SYNOPSIS
/var/spool/hylafax/bin/wedged devid device DESCRIPTION
bin/wedged is the command script invoked by the facsimile server when a modem is deemed to be in an irreparable state and requires operator intervention. This decision is based on the setting of the MaxSetupAttempts configuration parameter described in hylafax-config(5). The default wedged script sends electronic mail to the FaxMaster alias. The interval at which emails are sent can be configured in the etc/FaxDispatch file by setting the WEDGED_EMAIL_INTERVAL variable to the desired number of minutes (emails will be sent no more than every WEDGED_EMAIL_INTERVAL minutes, until the wedged condition persists). If the variable WEDGED_DISABLE_FAXGETTY is set in etc/FaxDispatch then the script will attempt to disable any faxgetty processes spawned by the init(8) process for the problematic modem. In addition the faxq(8) process automatically disables use of the modem for servicing outbound jobs. The devid argument is the identifier derived from the name of the modem's device file by substituting ``_'' characters for ``/'' charac- ters; e.g. term_10 for /dev/term/10. The device argument is the name of the character special device associated with the modem. If there exists an executable file /var/spool/hylafax/etc/resetmodem then that file will be executed upon execution of the wedged script in an effort to recover the modem. FILES
/usr/lib/sendmail for delivering mail SEE ALSO
faxq(8), hylafax-config(5) October 3, 1995 WEDGED(8)
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