Power Button Script

[bremenpl]

Hello there,
I am using Console version of debian provided on elinux.org on BeagleBone Black. My problem is that it misses the power button functionality. I have found this script for handling it:

#!/bin/sh

BTN=/dev/input/event0

while true; do
  BTNVAL=`hexdump -e '8/2 "%x " "\n"' -n 16 $BTN | grep ' 74 ' | awk '{print $7$
  if [ "$BTNVAL" = "1" ]
  then
    echo "Power button pressed"
    /sbin/sync
    /sbin/sync
    /sbin/shutdown -h now
    exit
  fi
  sleep 1
done

I have put a link to it into init.d and used update-rc to make it work at startup.
The problem is that it doesnt always work. Im not sure either it is running in the background or not, because when i use ps command i dont see the script running and even though the power button works. So lets say every 3rd power up the power button doesnt work... Im not sure whats the case. I would also aprichiate if someone told me either this is the proper way of handling the power button in the official bigger image.

[bremenpl]

Also I forgot to mention, that in the script I actually have to put the line /sbin/shutdown -h now twice... Otherwise after I press the button the message that the system is going down is displayed, but the system is not turning off. Then I press it again and its going down.

[Don deJuan]

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There is problems with the script, not sure if it was a bad paste or not.

Look at your BTNVAL

[Bremenpl]

Yes it was a bad pase, here is the script (unles you meant something else):

#!/bin/sh

BTN=/dev/input/event0

while true; do

  BTNVAL=`hexdump -e '8/2 "%x " "\n"' -n 16 $BTN | grep ' 74 ' | awk '{print $7}'`

  if [ "$BTNVAL" = "1" ]
  then
    echo "Power button pressed"
    /sbin/sync
    /sbin/sync
    /sbin/shutdown -h now
    /sbin/shutdown -h now
    exit
  fi
  sleep 1
done

W dniu 2014-10-02 18:28, Don deJuan pisze:

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Bremenpl