[solved] cli-power-manager (autoshutdown)

[mamaw]

hello there script-gurus

once in a while, i left my laptop on unplugged till the battery drop. (fall asleep or stuff)
when comes to GUI, there's some choices of using power manager to auto shutdown or hibernate when the battery has reach some amount of level predefined.

but what about cli?
to monitoring the battery level maybe i can run
$ watch --interval=xx acpi

is there any how-to's to auto shutdown when battery is critical, say 5% in cli environtment?

thanks in advance

[machinebacon]

Hello,
yes, that should be possible. Just quickly confirming,

Code: Select all

cat /sys/class/power_supply/BAT0/energy_now

is the value we need, now the question is only: how much is 5%
We have a value 'full' coming from

Code: Select all

cat /sys/class/power_supply/BAT0/energy_full_design

So, we could write a start service (in /etc/rc5.d/) that is executed every 600 seconds (10 minutes), which reads the energy_now value, and as soon as it falls below a level, a xmessage pops up to save all documents and then, again after 90 seconds, to shutdown.

Just an idea.

[machinebacon]

Who is our friend? Google. "monitor battery debian no-X" brings http://blog.sleeplessbeastie.eu/2013/01 ... -capacity/
There are quite some ideas, just the paths have to be changed a bit. See the "RRDtool" part, where he uses 'watch' to read the output of a script. The script would only grep/echo the energy_now value, which needs to be played with.

[machinebacon]

Here's a solution using conky: http://linuxmintdebian.blogspot.com/200 ... rning.html

Instead of conky, make a watch line in /etc/rc.local that calls the 'warn-shutdown' script (which is executable and with the right permissions)

[mamaw]

thanks MB, i will tinker with it a bit.
i did ask uncle google several times, but i guess i miss the right keyword :(

[machinebacon]

People will anally rape me for saying this, but I use a certain email address to log in to Google Services, and it seems to me that after a while the search engine learns which kind of posts should be displayed first. After having used this service for several months, I must say that it has convinced me, even though the privacy-sensitive readers already prepare the vaseline for me.

[rhowaldt]

privacy is bloat.

[dkeg]

i've used conky solution for coloring the batt percentage when low. Still miss it sometimes though.

google is very dissappointed in my offerings.

[machinebacon]

One could send the warning to dunst (or any other notifier daemon), or send a beep, play a sound file, open an xmessage, or make the keyboard indicators blink.

[ivanovnegro]

I must say that it has convinced me, even though the privacy-sensitive readers already prepare the vaseline for me.

:D It is true Jules. It works like spam filters.

[mamaw]

so, finally ... (how many days already?)

with my zero knowledge of bash :D #laugh
i managed to write this first bash script of mine:

Code: Select all

#!/bin/bash

while true
do

bat1=500000 #or any (critical) battery value
bat2=`cat /sys/class/power_supply/BAT1/energy_now`
sleep 5s 

if [ "$bat1" -gt "$bat2"] ; then
sudo shutdown -h now
fi
done

this required passw, so i add to visudo

%sudo ALL=NOPASWWD: /sbin/shutdown

and this solved it. cheers..
----------------------------------------
i believe the script is far from "proper" ;)

[mamaw]

a little update, to show the percentage of the battery from tmux :p

Code: Select all

#!/bin/bash

red='\e[0;31m'
yellow='\e[1;33m'
NC='\e[0m'
bat1=3500000
bat3=`cat /sys/class/power_supply/BAT1/energy_full_design`

while true
do
clear
bat2=`cat /sys/class/power_supply/BAT1/energy_now`
bat4=`echo "scale=2;($bat2*100)/$bat3" | bc`
stat=`cat /sys/class/power_supply/BAT1/status`
echo $bat4"%" $stat
sleep 5s
if [ "$bat1" -gt "$bat2" ] ; then
	clear
	echo -e $bat4"% ${yellow}Critical Battery${NC}" 
	echo -e "Press ${red}'ctrl+c'${NC} to skip shutdown. Shutdown in 60 second..."
	sleep 60s
	sudo shutdown -h now
	exit 1
fi
done

the output:
44.03% Discharging

*i login to openbox for a while since i miss those colorfull pic instead of:

Google
[___________________________________] Advanced search Language tools
[Google Search] [I'm Feeling Lucky]

[machinebacon]

^sweet ;)

You can try, in TTY without tmux:
xlinks2 google.com

There you have your colorful pic :)