xenocara/dist/xkeyboard-config/symbols/ctrl

// Eliminate CapsLock, making it another Ctrl.
partial modifier_keys 
xkb_symbols "nocaps" {
    replace key <CAPS>	{ [ Control_L, Control_L ] };
    modifier_map  Control { <CAPS>, <LCTL> };
};

// Make the left Ctrl key a left Meta.
xkb_symbols "lctrl_meta" {
    replace key <LCTL>	{ [ Meta_L ] };
};

// Swap the functions of the CapsLock key and the left Ctrl key.
partial modifier_keys 
xkb_symbols "swapcaps" {
    replace key <CAPS>	{ [ Control_L ] };
    replace key <LCTL>	{ [ Caps_Lock ] };
};

// Move Ctrl to the leftmost key on the middle row and CapsLock to the
// leftmost key on the bottom row.  Only works if the geometry or keycodes
// file has defined appropriate aliases for the keys in question.
partial modifier_keys 
xkb_symbols "ac_ctrl" {
    replace key <AC00>	{ [ Control_L ] };
    replace key <AA00>	{ [ Caps_Lock ] };
};

// Move Ctrl to the leftmost key on the bottom row and CapsLock to the
// leftmost key on the middle row.  Only works if the geometry or keycodes
// file has defined appropriate aliases for the keys in question.
partial modifier_keys 
xkb_symbols "aa_ctrl" {
    replace key <AA00>	{ [ Control_L ] };
    replace key <AC00>	{ [ Caps_Lock ] };
};

// Right Ctrl key functions as another right Alt.
partial modifier_keys 
xkb_symbols "rctrl_ralt" {
    key <RCTL>	{ symbols[Group1]= [ Alt_R ] };
};

// Menu key functions as another right Ctrl.
partial modifier_keys
xkb_symbols "menu_rctrl" {
    replace key <MENU>	{ [ Control_R, Control_R ] };
    modifier_map Control { Control_L, <MENU> };
};

// Right Alt key functions as another right Ctrl.
partial modifier_keys 
xkb_symbols "ralt_rctrl" {
    replace key <RALT> { type[Group1] = "TWO_LEVEL",
                         symbols[Group1] = [ Control_R, Control_R ] };
    modifier_map Control { <RALT> }; 
};