Documentation for `cpu_temp_monitor.sh` Script

Overview

The cpu_temp_monitor.sh script is a simple utility designed to monitor the CPU temperature of a Mac and send a notification if the temperature exceeds 50°C. This script leverages built-in macOS utilities and the osascript command to display notifications.

Prerequisites

macOS operating system
Basic knowledge of Terminal and shell scripting

Script Breakdown

get_cpu_temp Function

get_cpu_temp() {
  ioreg -n AppleSmartBattery -r | grep -i "temperature" | awk '{print $3}' | sed 's/[^0-9]*//g'
}

Purpose: Extracts the CPU temperature.
Details:
- ioreg -n AppleSmartBattery -r: Lists hardware information.
- grep -i "temperature": Filters lines containing the term "temperature".
- awk '{print $3}': Extracts the third field (temperature value).
- sed 's/[^0-9]*//g': Cleans the extracted value, removing non-numeric characters.

Main Script

# Convert to Celsius
cpu_temp=$(($(get_cpu_temp) / 100))

# Set the threshold
threshold=50

# Check if the temperature exceeds the threshold
if [ "$cpu_temp" -gt "$threshold" ]; then
  osascript -e 'display notification "CPU temperature exceeds 50°C!" with title "CPU Alert"'
fi

Convert to Celsius: The cpu_temp value is divided by 100 to convert it from a higher scale to Celsius.
Set the threshold: Defines the temperature limit (50°C) for triggering the alert.
Check and Notify:
- Compares the current CPU temperature (cpu_temp) to the threshold.
- Uses osascript to display a macOS notification if the threshold is exceeded.

Instructions

Saving the Script

Open Terminal.
Create a new script file:
```
touch cpu_temp_monitor.sh
```
Paste the script content into the file.
Save and exit (Ctrl+X, then Y, then Enter).

Making the Script Executable

chmod +x cpu_temp_monitor.sh

Automating the Script

To run the script at regular intervals, use cron:

Open the crontab editor:
```
crontab -e
```
Add a new cron job to run the script every minute:
```
*/1 * * * * /path/to/cpu_temp_monitor.sh
```

Replace /path/to/cpu_temp_monitor.sh with the actual path to your script.

Conclusion

This script provides a simple and effective way to monitor CPU temperature on a Mac and receive notifications if it exceeds a safe threshold. With some additional customization, it can be adapted for more complex monitoring and alerting requirements.

clear-solutions/mac-utils

Documentation for cpu_temp_monitor.sh Script