install-user-key-mapping.sh

mkdir -p /Users/Shared/bin
echo '''#!/bin/sh\nhidutil property --set '\'{\"UserKeyMapping\":\[\{\"HIDKeyboardModifierMappingSrc\":0x7000000e6,\"HIDKeyboardModifierMappingDst\":0x70000006d\}\]\}\''''' > /Users/Shared/bin/right-option-to-f18-key-mapping
chmod 755 /Users/Shared/bin/right-option-to-f18-key-mapping
sudo cat<<: >/Users/Shared/bin/right-option-to-f18-key-mapping.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>Right Alt(Option) to F18</string>
    <key>ProgramArguments</key>
    <array>
        <string>/Users/Shared/bin/right-option-to-f18-key-mapping</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
</dict>
</plist>
:
sudo mv /Users/Shared/bin/right-option-to-f18-key-mapping.plist /Library/LaunchAgents/right-option-to-f18-key-mapping.plist
sudo chown root /Library/LaunchAgents/right-option-to-f18-key-mapping.plist
sudo launchctl load /Library/LaunchAgents/right-option-to-f18-key-mapping.plist