defaults

# read all config
defaults read

# read
defaults read <domain> <key>
defaults read "com.apple.bluetoothd.plist" "LinkKeys"

# write
defaults write -g InitialKeyRepeat -int 15 # 225 ms
defaults write -g KeyRepeat -int 2 # 30 ms

# delete
defaults delete /Library/Preferences/com.apple.DiskArbitration.plist IgnoredDiskUUIDs