swapping Ctrl-Caps keys from terminal

modifykeys.sh

#!/bin/bash                                                                    
key="com.apple.keyboard.modifiermapping"                                       

defaults -currentHost delete -g $key                                           
defaults -currentHost write -g $key '(                                         
                {                                                              
            HIDKeyboardModifierMappingDst = 2;                                 
            HIDKeyboardModifierMappingSrc = 0;                                 
        },                                                                     
                {                                                              
            HIDKeyboardModifierMappingDst = 0;                                 
            HIDKeyboardModifierMappingSrc = 2;                                 
        },                                                                     
                {                                                              
            HIDKeyboardModifierMappingDst = 0;                                 
            HIDKeyboardModifierMappingSrc = 10;                                
        }                                                                      
    )'