You can create a background script that monitors your Mac's USB ports and terminates the application when the key is missing.Step 1: Create the Shell ScriptOpen the Terminal app on your Mac.Create a script file by running:
bashnano ~/auto_quit_yubico.sh
Paste the following script into the editor:
bash#!/bin/bash
while true; do
# Check if Yubico Authenticator is running
if pgrep -x "Yubico Authenticator" > /dev/null; then
# Check if a YubiKey is plugged into the USB system
if ! ioreg -p IOUSB -l | grep -i "Yubico" > /dev/null; then
# If app is open but no YubiKey is found, quit the app
osascript -e 'quit app "Yubico Authenticator"'
fi
fi
sleep 3
done
Press Ctrl + O then Enter to save, and Ctrl + X to exit the editor.
Make the script executable by running:
bashchmod +x ~/auto_quit_yubico.sh
Step 2: Make it Run Automatically (Launchd Agent)To keep this script running quietly in the background every time you log into your Mac:
Create a launch agent configuration file:
bashnano ~/Library/LaunchAgents/com.user.yubicoquit.plist
Paste the following configuration:
xml<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://apple.com">;
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.user.yubicoquit</string>
<key>ProgramArguments</key>
<array>
<string>/bin/bash</string>
<string>/Users/YOUR_USERNAME/auto_quit_yubico.sh</string>
</array>
<key>RunAtLoad</key>
<true/>
<key>KeepAlive</key>
<true/>
</dict>
</plist>
(Note: Replace YOUR_USERNAME with your actual macOS short username).Save and exit (Ctrl + O, Enter, Ctrl + X).
Start the background service immediately:
bashlaunchctl load ~/Library/LaunchAgents/com.user.yubicoquit.plist
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