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Simple CEC run command on event script

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# 1  
Old 01-20-2017
Simple CEC run command on event script
To cut a long story short I need to implement a CEC server in order to allow my Samsung TV to interact with other peripherals. I plan on using a RPi for this purpose.

I have installed CEC-untils and can run the tvservice monitor to look for HDMI events. I now need a simple script that will run on boot to issue a command on one of these events.

The output of the tvservice monitor is:
Code:
/opt/vc/bin/tvservice -M
Starting to monitor for HDMI events
[I] HDMI cable is unplugged
[I] HDMI is attached

My script meeds to look something like:
Code:
#!/bin/sh
/opt/vc/bin/tvservice -M

If  "[I] HDMI is attached"
then do "some command"

END

Thanks
# 2  
Old 01-23-2017
I am assuming this might work?
Code:
/opt/vc/bin/tvservice -M | grep -q "HDMI is attached" && RunCommand

---------- Post updated at 02:04 PM ---------- Previous update was at 01:35 PM ----------

So my bash script would look like this:
Code:
#!/bin/bash 
while : 
do     
/opt/vc/bin/tvservice -M | grep -q "HDMI is attached" && RunCommand 
done

Last edited by barrydocks; 01-23-2017 at 10:05 AM.. Reason: typo
# 3  
Old 01-23-2017
Not really, that waits for the command to finish and quit before running RunCommand or not. You want to deal with lines, I think:

Code:
/opt/bin/tvservice -M 2>&1 | while read LINE
do
        case "$LINE" in
        *Attached*) RunCommand ;;
        *) ;;
        esac
done

The 2>&1 may not be necessary, I'm just hedging my bets in case it prints to stderr instead of stdout.
These 2 Users Gave Thanks to Corona688 For This Post:
barrydocks jim mcnamara
# 4  
Old 01-24-2017
Thankyou Corona688, works a treat. Now made the script run at startup.

So my code is
Code:
#!/bin/bash
echo "on 5" | cec-client -s #switch audio on
echo "is" | cec-client -s #make RPi inactice CEC source

/opt/vc/bin/tvservice -M 2>&1 | while read LINE #run tvservice monitor
do
        case "$LINE" in
        *attached*) echo "on 5" | cec-client -s ;; #switch on audio when TV is plugged in
        *) ;;
        esac
done

This User Gave Thanks to barrydocks For This Post:
Corona688
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