Attempt to update ModifierMapping via Command Line

set_ModifierMapping.sh

#!/bin/bash
#
# WARNING
#
# This script does not "work". It does correctly upate the preferences (good syntax).
# However, those settings are not reloaded until the user logs in again.
# They do NOT apply to the current session, and I haven't been able to find anything that
# can reload these values, other than AppleScript (with Accessability) simulating user input
# to the System Preferences application.
#

# Since this script can't achieve its purpose, I've left it unfinished, with considerable debug code.

# To Get IDs
# ioreg -n IOHIDKeyboard -r | grep -e 'class IOHIDKeyboard' -e VendorID\" -e ProductID\"
VendorID=16700
ProductID=8455
KEY=com.apple.keyboard.modifiermapping.$VendorID-$ProductID-0
defaults -currentHost read -g $KEY

MacStyle=$(tr -d '[:space:]' <<PLIST
	<array>
		<dict>
			<key>HIDKeyboardModifierMappingDst</key>
			<integer>4</integer>
			<key>HIDKeyboardModifierMappingSrc</key>
			<integer>3</integer>
		</dict>
		<dict>
			<key>HIDKeyboardModifierMappingDst</key>
			<integer>12</integer>
			<key>HIDKeyboardModifierMappingSrc</key>
			<integer>11</integer>
		</dict>
		<dict>
			<key>HIDKeyboardModifierMappingDst</key>
			<integer>3</integer>
			<key>HIDKeyboardModifierMappingSrc</key>
			<integer>4</integer>
		</dict>
		<dict>
			<key>HIDKeyboardModifierMappingDst</key>
			<integer>11</integer>
			<key>HIDKeyboardModifierMappingSrc</key>
			<integer>12</integer>
		</dict>
	</array>
PLIST
)
# <array>
# <dict>
# 	<key>HIDKeyboardModifierMappingSrc</key><integer>3</integer>
# 	<key>HIDKeyboardModifierMappingDst</key><integer>4</integer>
# </dict><dict>
# 	<key>HIDKeyboardModifierMappingSrc</key><integer>4</integer>
# 	<key>HIDKeyboardModifierMappingDst</key><integer>3</integer>
# </dict><dict>
# 	<key>HIDKeyboardModifierMappingSrc</key><integer>11</integer>
# 	<key>HIDKeyboardModifierMappingDst</key><integer>12</integer>
# </dict><dict>
# 	<key>HIDKeyboardModifierMappingSrc</key><integer>12</integer>
# 	<key>HIDKeyboardModifierMappingDst</key><integer>11</integer>
# </dict>
# </array>
# PLIST
# )

echo Delete
defaults -currentHost delete -g $KEY
echo

echo Write
echo "defaults -currentHost write -g $KEY -array-add $MacStyle"
echo
defaults -currentHost write -g $KEY $MacStyle
echo
killall -u $USER cfprefsd
echo Read
defaults -currentHost read -g $KEY
echo

# plutil -convert xml1 -o - ~/Library/Preferences/ByHost/.GlobalPreferences.6AF4C9D6-4F93-551B-9480-A89666A74A9D.plist

exit
# Key Codes:
#   None — –1
#   Caps Lock — 0
#   Shift (Left) — 1
#   Control (Left) — 2
#   Option (Left) — 3
#   Command (Left) — 4
#   Keypad 0 — 5
#   Help — 6
#   Shift (Right) — 9
#   Control (Right) — 10
#   Option (Right) — 11
#   Command (Right) — 12


defaults -currentHost write -g com.apple.keyboard.modifiermapping.1118-219-0 -array-add '<dict><key>HIDKeyboardModifierMappingDst</key><integer>-1</integer><key>HIDKeyboardModifierMappingSrc</key><integer>0</integer></dict>'

defaults -currentHost delete -g $mappingplist

# $ keyboard_id = "$(ioreg -n IOHIDKeyboard -r | grep -e VendorID\" -e ProductID | tr -d \"\|[:blank:] | cut -d\= -f2 | tr '\n' -)"
# $ defaults -currentHost write -g "com.apple.keyboard.modifiermapping.${keyboard_id}0" '(
# {
#   HIDKeyboardModifierMappingDst = 2;
#   HIDKeyboardModifierMappingSrc = 0;
# })'

# defaults write com.apple.universalaccess mouseDriverCursorSize 4.0