Remapping Keys in macOS

install-userkeymap.sh

#!/bin/bash
# Remapping Keys in macOS
# https://developer.apple.com/library/archive/technotes/tn2450/_index.html
set -e
userscript="$HOME/bin/userkeymap"
mkdir -p "$HOME"/bin
cat <<EOF > "$userscript"
#!/bin/bash
hidutil property --set '{"UserKeyMapping": [
    {"HIDKeyboardModifierMappingSrc": 0x700000064, "HIDKeyboardModifierMappingDst": 0x700000035}
    ]}'

EOF
mkdir -p "$HOME/Library/LaunchAgents"
cat<<EOF >"$HOME/Library/LaunchAgents/userkeymap.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>userkeymap</string>
    <key>ProgramArguments</key>
    <array>
        <string>$userscript</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
</dict>
</plist>
EOF
chmod +x "$userscript"