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Tags:
power-management
hibernate
ups
nut
Link:
🔍 See Original Answer on Ask Ubuntu ⧉ 🔗
URL:
https://askubuntu.com/q/1157949
Title:
execute script on low UPS power
ID:
/2019/07/13/execute-script-on-low-UPS-power
Created:
July 13, 2019
Upload:
September 15, 2024
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Ubuntu automatically keeps track of all batteries status:
The same information displayed in the GUI screen above can also be accessed from your terminal / shell / bash script (they are all sort of the same thing in many ways).
To get the same information from CLI use:
$ upower -i $(upower -e | grep -i UPS)
native-path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1.2/1-1.2:1.0/usbmisc/hiddev2
vendor: CPS
model: CP550HGa
serial: BFBB104#BI1.g
power supply: yes
updated: Fri 12 Jul 2019 06:35:56 PM MDT (12 seconds ago)
has history: yes
has statistics: yes
ups
present: yes
state: fully-charged
warning-level: none
time to empty: 25.5 minutes
percentage: 100%
icon-name: 'battery-full-charged-symbolic'
Then to narrow it down to percentage use:
$ upower -i $(upower -e | grep -i UPS) | grep -i percentage
percentage: 100%
Then to extract the second column use:
$ upower -i $(upower -e | grep -i UPS) | grep -i percentage | cut -d':' -f2
100%
Then to extract only digits and eliminate leading spaces and trailing % use:
$ upower -i $(upower -e | grep -i UPS) | grep -i percentage | sed 's/[^0-9]*//g'
100
Now assign what you want to a variable and display it:
$ PERCENT=$(upower -i $(upower -e | grep -i UPS) | grep -i percentage | sed 's/[^0-9]*//g')
$ echo $PERCENT
100
Next step is to write a script something like this
#!/bin/bash
while true; do
PERCENT=$(upower -i $(upower -e | grep -i UPS) | grep -i percentage \
| sed 's/[^0-9]*//g')
if [[ "$PERCENT" -lt 50 ]] ; then
# email my cell phone
mail -s "Electricity grid has shut down, run home" someone@example.com
# text my cell phone
curl -X POST https://textbelt.com/text --data-urlencode \
phone="999-333-4567" --data-urlencode \
message="Electricity grid has shot down, run home" -d key=textbelt
fi
sleep 300 # Sleep for 5 minutes to reduce resource usage
done
- emailing cell phone: Use mail command
- texting cell phone: How can I send mobile text message from terminal?
This is a script I would use, in your case adapt it to hibernate (I have a laptop so I never hibernate). My UPS is for window fan, not laptop which has it’s own battery and is suspended when I’m at work. Technology can be used differently by different people.