vim /usr/share/X11/xkb/symbols/command_ctrl

command_ctrl

// Ctrl is mapped to the Command keys (and the usual Ctrl keys).
partial modifier_keys
xkb_symbols "command_ctrl_mac" {
    key <LWIN> { [ Control_L ] };
    key <RWIN> { [ Control_R ] };
    key <LALT> { [ Super_L ] };
    modifier_map Control { <LWIN>, <RWIN> };
    // modifier_map Mod1 { Alt_L, Alt_R };
    modifier_map Mod4 { <LALT> };
};

// Ctrl is mapped to the Alt and Alt mapped to win
partial modifier_keys
xkb_symbols "command_ctrl_pc" {
    //key <LWIN> { [ Alt_L ] };
    key <LALT> { [ Control_L, Control_L ] };
    modifier_map Control { <LALT> };
    //modifier_map Mod1 {  <LWIN> };
};
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