gistfile1.txt

$ ag '(ctrl|caps):' /usr/share/X11/xkb/rules/base.lst
755:  ctrl:nocaps          Caps Lock as Ctrl
756:  ctrl:lctrl_meta      Left Ctrl as Meta
757:  ctrl:swapcaps        Swap Ctrl and Caps Lock
758:  ctrl:ac_ctrl         At left of 'A'
759:  ctrl:aa_ctrl         At bottom left
760:  ctrl:rctrl_ralt      Right Ctrl as Right Alt
761:  ctrl:menu_rctrl      Menu as Right Ctrl
762:  ctrl:ctrl_ralt       Right Alt as Right Ctrl
763:  ctrl:swap_lalt_lctl  Swap Left Alt key with Left Ctrl key
764:  ctrl:swap_lwin_lctl  Swap Left Win key with Left Ctrl key
765:  ctrl:swap_lalt_lctl_lwin Left Alt as Ctrl, Left Ctrl as Win, Left Win as Alt
789:  caps:internal        Caps Lock uses internal capitalization; Shift "pauses" Caps Lock
790:  caps:internal_nocancel Caps Lock uses internal capitalization; Shift doesn't affect Caps Lock
791:  caps:shift           Caps Lock acts as Shift with locking; Shift "pauses" Caps Lock
792:  caps:shift_nocancel  Caps Lock acts as Shift with locking; Shift doesn't affect Caps Lock
793:  caps:capslock        Caps Lock toggles normal capitalization of alphabetic characters
794:  caps:numlock         Make Caps Lock an additional Num Lock
795:  caps:swapescape      Swap ESC and Caps Lock
796:  caps:escape          Make Caps Lock an additional ESC
797:  caps:backspace       Make Caps Lock an additional Backspace
798:  caps:super           Make Caps Lock an additional Super
799:  caps:hyper           Make Caps Lock an additional Hyper
800:  caps:shiftlock       Caps Lock toggles ShiftLock (affects all keys)
801:  caps:none            Caps Lock is disabled
802:  caps:ctrl_modifier   Make Caps Lock an additional Ctrl