battery.sh

#!/bin/bash

# Thanks to Andrew Zhang in hangops on 2024-10-18

# Get the battery percentage
battery_info=$(pmset -g batt)
battery_discharging=$(echo "$battery_info" | grep discharging -c)
battery_percentage=$(echo "$battery_info" | grep -o "[0-9]*%" | tr -d '%')

# Check if the battery percentage is less than threshold
if [ "$battery_discharging" -eq "0" ]; then
    # echo "Battery is charging"
    exit 0
fi

if [ "$battery_percentage" -lt 10 ]; then
    # echo "Battery is low"
    osascript -e 'display notification "Battery is at '$battery_percentage'%. Sounding alarm" with title "Alert"'
    # Use a system sound command (e.g., afplay) to play a sound as an alarm
    afplay /System/Library/Sounds/Glass.aiff
# else
#     echo "Battery is greater than 10"
fi

ding-notify-laptop-when-battery-is-under-a-threshold.md

Ding laptop when under a battery percent

Context

Often times the low battery notification can be ignored. It notifies around ~10% and then someone can go off and do other things. Usually in a zoom, the laptop can suddenly die taking seconds or even minutes to come back online.

Solution

Use a shell script on a cron to notify every minute it's charging. Depending on the rate of discharge, this can be 10 or more dings before the laptop is dead.

1. Setup a directory

   mkdir -p $HOME/scripts

2. Download the battery.sh script

   wget \
     https://gist.githubusercontent.com/nitrocode/6a03f19b24c4bd7c2aa7fd34fc00c493/raw/battery.sh \
     -O $HOME/scripts/battery.sh

3. Set the script to execute

   chmod +x $HOME/scripts/battery.sh

4. Run the script as a test

   $HOME/scripts/battery.sh

5. Setup crontab

   crontab -e

   * * * * * /Users/user/scripts/battery.sh

Notes

Every time a cron script runs echo, it will show up as a new message in mail. This is why the above echo calls have been commented out.

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