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Full Discussion: Telnet script to amplifier
Top Forums Shell Programming and Scripting Telnet script to amplifier Post 302901065 by Don Cragun on Sunday 11th of May 2014 03:11:58 PM
Old 05-11-2014
Quote:
Originally Posted by drogert
Thanks! You are helping me allot!

When I add this code into the command line it gives me this:

Code:
{
>   sleep 2
>   echo mz
>   sleep 2
>   } | telnet 192.168.1.155
Trying 192.168.1.155...
Connected to 192.168.1.155.
Escape character is '^]'.
BridgeCo AG Telnet server
FL022020204D555445204F4646202020
MUT1
Connection closed by foreign host.

This is just fine because it mutes the amp. This also works inside a bash script, making it executable and running it from the commandline.

When I add your script into the commandline it doesn't give me any errors, but it doesnt do anything else. It just goes back to the commandline. Maybe the connection is closed by foreign host maybe the problem. I also tried with or without the "" and this wasn't the solution. What am I doing wrong?

thanks again!
You aren't seeing the output from the 1st telnet session because the script is reading it instead of displaying it on the terminal. I was mistakenly expecting to see only PWR0 or PWR1 on the 1st (and only) line of output from telnet. Let's try a slight modification:
Code:
#!/bin/ksh
echo '*** Request amp status...'
{	sleep 2
	echo '?p'
	sleep 2
} | telnet 192.168.1.155 | while read power
do	printf "%s\n" "$power"
	if [ "$power" = "PWR1" ]
	then 	echo '*** Amp power is on; send mute command...'
		{	sleep 2
			echo MZ
			sleep 2
		} | telnet 192.168.1.155
		echo '*** Amp should be muted now.'
	fi
done

This should let us see the output from both telnet sessions (assuming we do get a line from the 1st session that just contains "PWR1").

(I normally use ksh, but this script should also work with bash.)
 

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LEARN ABOUT SUSE

tgt-setup-lun

tgt-setup-lun(8)					      System Manager's Manual						  tgt-setup-lun(8)

NAME

       tgt-setup-lun - creates a target, adds a device to the target and defines initiators that can connect to the target

SYNOPSIS

       tgt-setup-lun -d device -n target_name [initiator_IP1 initiator_IP2 ...] [-h]

DESCRIPTION

       Starts tgtd if necessary and creates a target according to the supplied target_name. The format of the target name is as follows:
       iqn.2001-04.com.<hostname>-<target_name> The target name must be unique.

       The  script then adds the requested device to the target. If specific IP addresses are defined, it adds them to the list of allowed initia-
       tors for that target. If no IP addresses is defined, it defines that the target accepts any initiator.

EXAMPLES

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81 and 192.168.10.82:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81 192.168.10.82

       Create a target that uses /dev/sdb1 and allows connections from any initiator:
       tgt-setup-lun -d /dev/sdb1 -n my_target

       Display help:
       tgt-setup-lun -h

AUTHOR

       Written by Erez Zilber

REPORTING BUGS

       Report bugs to <erezz@voltaire.com>.

COPYRIGHT

       Copyright (C) Voltaire Ltd. 2008.

																  tgt-setup-lun(8)
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