4

I am trying to run this script:
test.sh

#!/bin/bash  
BAT_LEVEL=`acpi -b |grep -Eo "[0-9]+%"|grep -Eo "[0-9]+"`
CRIT=0                                                           
if [ $BAT_LEVEL -gt $CRIT ]; then
    echo "foo"
    aplay ~/apert.wav
    notify-send "Battery-Low"
    echo "bar"
fi

The sixth line from above which is notify-send "Battery-Low" works just as you'd expect in terminal.
But when the script is executed it just spits out foo and bar on stdout.
I have no clue what the problem might be.

Improve this question
4
  • Are you invoking this script at a shell prompt? If not, how? Commented Sep 24, 2015 at 22:43
  • I made the file executable. and all I'm doing is ./test.sh in the directory of the file inside M-x shell of emacs. Commented Sep 25, 2015 at 2:27
  • Well, that had me thinking. Turns out the script runs just fine from terminal emulator. I can't see why it shouldn't work from inside of emacs shell! Also the aplay line gives me some error too. Commented Sep 25, 2015 at 2:42
  • Did you ever figure this out? Commented Apr 10, 2020 at 1:43

1 Answer 1

Reset to default
4

You are missing some environment variables, most likely the DISPLAY one. You could try the following:

echo "foo"                                                   
DISPLAY=:0.0 notify-send "Battery-Low"                                    
echo "bar"

If that doesn't help, you could compare the environment inside the script and in a terminal by running the env command in both.

Also note that if the script is being run as root, you may have to do something like this:

sudo -u yourUsername DISPLAY=:0.0 notify-send 'Battery low'
Improve this answer
4
  • I was indeed running the script as root. But the notification still doesn't appear when I do sudo -u bibek DISPLAY=0.0 notify-send "battery-low". It doesn't give me any error either. Commented Sep 25, 2015 at 2:50
  • 1
    @coder_Bibek You also need to set the variable DBUS_SESSION_BUS_ADDRESS to what it is in your normal session. We can give more guidance if you explain how you run the script, what you've said about that so far is strange (as root and inside Emacs? are you running Emacs as root?). Commented Sep 25, 2015 at 8:08
  • Note that there should be a : before the 0.0 for it to work. But yes, notify-send needs the session bus as well, and I can't think of a clean way to get it... Check with env to see if it's set? Commented Sep 25, 2015 at 8:15
  • env | grep DBUS give me same output DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus on both the shells as root and as user bibek. And yes, I am running emacs as root with sudo emacs & from the terminal emulator. (Accessing root files with normal emacs session is painful, at best; and I'ven't given other methods a try yet.) Commented Sep 25, 2015 at 10:51

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.