Shell Programming and Scripting

Hi all!

I have a Pioneer VSX-921 which I am very happy about. It has airplay, lots of other features. One of them is controlling it with your Iphone and telnet.
And now it becomes interesting! I want to make a bash script to log into my amp, send a command: MZ (which means mute) and then exit the telnet session.

I allready installed telnet

Code:

sudo apt-get install telnet

I can login with: telnet 192.168.1.155 (it doesn't require a password and portnmbr)
its gives this:

Code:

Trying 192.168.1.155...
Connected to 192.168.1.155.
Escape character is '^]'.
BridgeCo AG Telnet server

and when I type MZ it mutes the amp.

Now, is it possible to put this into a script? I allready tried this:

Code:

#!/bin/sh

#################################################################

spawn telnet 192.168.1.155
send "MZ"

but is says unknown command spawn and send...

It is also possible to ask the amp what status it has (on/of, mute on/off, how high the volume is and etc) For example: when I type ?p it gives back a code PWR0 or PWR1 (so on or off)

I want to make a script that checks if the amp is on, and if so, it mutes the amp when the script is run.

If I can get some kind of example that would be great!, I can experiment from there... But now, i am stuck :roll:

Thanks anyway!

anyone?

Try:

Code:

{
  sleep 2
  echo MZ
  sleep 2
  } | telnet 192.168.1.155

spawn and sendare expect, not shell, commands.
The script will be more robust, if you rewrite it in expect.

try…

Code:

telnet 192.168.1.155<<EOF
send MZ
EOF

WOW, it works

I am very happy now! thank you very very much!.
You said it would be more robust if I rewrite this into a expect? but how must I do this. I am running this on a Raspberry Pi BTW.

and is it also to send a command ?p which gives a result PWR0 or PWR1 and then react on it. So something like this

Code:

{
  sleep 2
  echo ?p
If PWR0
then 
echo MZ
  sleep 2
  } | telnet 192.168.1.155

Or something like this? I allready tried it but it gaive me a syntax error near }

Assuming that PWR0 means the power is off and PWR1 means the power is on, and assuming that you want to mute if the power is on, I think you want something more like:

Code:

{
        sleep 2
        echo '?p'
        sleep 2
} | telnet 192.168.1.155 | (
        read power
        if [ "$power" = "PWR1" ]
        then {  sleep 2
                echo MZ
                sleep 2
        } | telnet  192.168.1.155
        fi
)

Obviously, this is untested (since I don't have an amp like this). If the amplifier has a command to terminate a command session, (something like exit or quit) you probably also want to add an echo to send that command to the amplifier in both of the above telnet scripts after the 2nd sleep.

Better quote the ? to prevent the shell from attempting a substitution.

Code:

  echo "?p"