mapkeys.sh

#!/bin/bash

lctrl=30064771296
rctrl=30064771300
lcmd=30064771299
rcmd=30064771303
loption=30064771298
roption=30064771302

# -1 none
# 0 caps lock
# 1 left shift
# 2 left control
# 3 left option
# 4 left command
# 5 keypad 0
# 6 help
# 9 right shift
# 10 right control
# 11 right option
# 12 right command

# MAPPING="
# (
#   {
#     HIDKeyboardModifierMappingDst = $lctrl;
#     HIDKeyboardModifierMappingSrc = $lcmd;
#   },{
#     HIDKeyboardModifierMappingDst = $roption;
#     HIDKeyboardModifierMappingSrc = $rcmd;
#   },{
#     HIDKeyboardModifierMappingDst = $rcmd;
#     HIDKeyboardModifierMappingSrc = $roption;
#   }
# )
# "
#defaults -currentHost write -g "$mappingplist" "$MAPPING"

mappingplist=com.apple.keyboard.modifiermapping.1452-628-0

defaults -currentHost write -g "$mappingplist" -array "
<dict>
  <key>HIDKeyboardModifierMappingDst</key><integer>$lctrl</integer>
  <key>HIDKeyboardModifierMappingSrc</key><integer>$lcmd</integer>
</dict>
" "
<dict>
  <key>HIDKeyboardModifierMappingDst</key><integer>$roption</integer>
  <key>HIDKeyboardModifierMappingSrc</key><integer>$rcmd</integer>
</dict>
" "
<dict>
  <key>HIDKeyboardModifierMappingDst</key><integer>$lcmd</integer>
  <key>HIDKeyboardModifierMappingSrc</key><integer>$loption</integer>
</dict>
" "
<dict>
  <key>HIDKeyboardModifierMappingDst</key><integer>$rcmd</integer>
  <key>HIDKeyboardModifierMappingSrc</key><integer>$roption</integer>
</dict>
"

defaults -currentHost read -g "$mappingplist"
echo Keys set, reboot or relogin required.

# mapping command ctrl to 
# (
#         {
#         HIDKeyboardModifierMappingDst = 30064771296;
#         HIDKeyboardModifierMappingSrc = 30064771299;
#     },
#         {
#         HIDKeyboardModifierMappingDst = 30064771300;
#         HIDKeyboardModifierMappingSrc = 30064771303;
#     }
# )

# mapping command to option
# (
#         {
#         HIDKeyboardModifierMappingDst = 30064771298;
#         HIDKeyboardModifierMappingSrc = 30064771299;
#     },
#         {
#         HIDKeyboardModifierMappingDst = 30064771302;
#         HIDKeyboardModifierMappingSrc = 30064771303;
#     }
# )

# https://apple.stackexchange.com/questions/4813/changing-modifier-keys-from-the-command-line/277544#277544