/usr/share/X11/xkb/symbols/capslock is in xkb-data 2.12-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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xkb_symbols "capslock" {
replace key <CAPS> { [ Caps_Lock ] };
modifier_map Lock { Caps_Lock };
};
partial hidden modifier_keys
xkb_symbols "shiftlock" {
replace key <CAPS> { [ Shift_Lock ] };
modifier_map Shift { Shift_Lock };
};
partial hidden modifier_keys
xkb_symbols "grouplock" {
replace key <CAPS> { [ ISO_Next_Group, Caps_Lock ] };
};
partial hidden modifier_keys
xkb_symbols "swapescape" {
key <CAPS> { [ Escape ] };
key <ESC> { [ Caps_Lock ] };
};
partial hidden modifier_keys
xkb_symbols "groupshift" {
key <CAPS> {
type[Group1] = "PC_ALT_LEVEL2",
[ Mode_switch, Caps_Lock ]
};
};
partial hidden modifier_keys
xkb_symbols "escape" {
key <CAPS> { [ Escape ] };
};
partial hidden modifier_keys
xkb_symbols "backspace" {
key <CAPS> { [ BackSpace ] };
};
partial hidden modifier_keys
xkb_symbols "super" {
key <CAPS> { [ Super_L ] };
modifier_map Mod4 { <CAPS> };
};
partial hidden modifier_keys
xkb_symbols "hyper" {
key <CAPS> { [ Hyper_L ] };
modifier_map Mod4 { <CAPS> };
};
partial hidden modifier_keys
xkb_symbols "none" {
key <CAPS> { [ VoidSymbol ] };
};
partial hidden modifier_keys
xkb_symbols "numlock" {
key <CAPS> { [ Num_Lock ] };
};
// This changes the <CAPS> key to become a Control modifier,
// but it will still produce the Caps_Lock keysym.
partial hidden modifier_keys
xkb_symbols "ctrl_modifier" {
replace key <CAPS> {
type[Group1] = "ONE_LEVEL",
symbols[Group1] = [ Caps_Lock ],
actions[Group1] = [ SetMods(modifiers=Control) ]
};
modifier_map Control { <CAPS> };
};
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