Undo

`⌘ Cmd` + `Z`

All hotkeys for Ace Editor (Mac)

Line operations Remove line	`⌘ Cmd` + `D`
Line operations Copy lines down	`⌘ Cmd` + `⌥ Option` + `↓`
Line operations Copy lines up	`⌘ Cmd` + `⌥ Option` + `↑`
Line operations Move lines down	`⌥ Option` + `↓`
Line operations Move lines up	`⌥ Option` + `↑`
Line operations Remove to line end	`Control` + `K`
Line operations Remove to linestart	`⌘ Cmd` + `⬅ Backspace`
Line operations Remove word left	`⌥ Option` + `⬅ Backspace`
Line operations Remove word left	`Control` + `⌥ Option` + `⬅ Backspace`
Line operations Remove word right	`⌥ Option` + `Del`
Line operations Split line	`Control` + `O`
Selection Select all	`⌘ Cmd` + `A`
Selection Select left	`↑ Shift` + `←`
Selection Select right	`↑ Shift` + `→`
Selection Select word left	`⌥ Option` + `↑ Shift` + `←`
Selection Select word right	`⌥ Option` + `↑ Shift` + `→`
Selection Select line start	`↑ Shift` + `Home`
Selection Select line end	`↑ Shift` + `End`
Selection Select to line end	`⌘ Cmd` + `↑ Shift` + `→`
Selection Select to line start	`⌘ Cmd` + `↑ Shift` + `←`
Selection Select up	`↑ Shift` + `↑`
Selection Select down	`↑ Shift` + `↓`
Selection Select page up	`Shift` + `Page Up`
Selection Select page down	`Shift` + `Page Down`
Selection Select to start	`⌘ Cmd` + `↑ Shift` + `↑`
Selection Select to end	`⌘ Cmd` + `↑ Shift` + `↓`
Selection Duplicate selection	`⌘ Cmd` + `↑ Shift` + `D`
Multicursor Add multi-cursor above	`Control` + `⌥ Option` + `↑`
Multicursor Add multi-cursor below	`Control` + `⌥ Option` + `↓`
Multicursor Add next occurrence to multi-selection	`Control` + `⌥ Option` + `→`
Multicursor Add previous occurrence to multi-selection	`Control` + `⌥ Option` + `←`
Multicursor Move multicursor from current line to the line above	`Control` + `⌥ Option` + `↑ Shift` + `↑`
Multicursor Move multicursor from current line to the line below	`Control` + `⌥ Option` + `↑ Shift` + `↓`
Multicursor Remove current occurrence from multi-selection and move to next	`Control` + `⌥ Option` + `↑ Shift` + `→`
Multicursor Remove current occurrence from multi-selection and move to previous	`Control` + `⌥ Option` + `↑ Shift` + `←`
Multicursor Select all from multi-selection	`Control` + `↑ Shift` + `L`
Go to Go to left	`←, Control` + `B`
Go to Go to right	`→, Control` + `F`
Go to Go to word left	`⌥ Option` + `←`
Go to Go to word right	`⌥ Option` + `→`
Go to Go line up	`↑, Control` + `P`
Go to Go line down	`↓, Control` + `N`
Go to Go to line start	`⌘ Cmd` + `←`
Go to Go to line start	`Home`
Go to Go to line start	`Control` + `A`
Go to Go to line end	`⌘ Cmd` + `→`
Go to Go to line end	`End`
Go to Go to line end	`Control` + `E`
Go to Scroll page up	`Option` + `Page Up`
Go to Scroll page down	`Option` + `Page Down`
Go to Go to page down	`Control` + `V`
Go to Go to start	`⌘ Cmd` + `Home`
Go to Go to start	`⌘ Cmd` + `↑`
Go to Go to end	`⌘ Cmd` + `End`
Go to Scroll line down	`⌘ Cmd` + `↓`
Go to Go to line	`⌘ Cmd` + `L`
Find / replace Find	`⌘ Cmd` + `F`
Find / replace Replace	`⌘ Cmd` + `⌥ Option` + `F`
Find / replace Find next	`⌘ Cmd` + `G`
Find / replace Find previous	`⌘ Cmd` + `↑ Shift` + `G`
Folding Fold selection	`⌘ Cmd` + `⌥ Option` + `L`
Folding Fold selection	`⌘ Cmd` + `F1`
Folding Unfold	`⌘ Cmd` + `⌥ Option` + `↑ Shift` + `L`
Folding Unfold	`⌘ Cmd` + `↑ Shift` + `F1`
Folding Fold all	`⌘ Cmd` + `⌥ Option` + `0`
Folding Unfold all	`⌘ Cmd` + `⌥ Option` + `↑ Shift` + `0`
Other Indent	`⭾ Tab`
Other Outdent	`↑ Shift` + `⭾ Tab`
Other Undo	`⌘ Cmd` + `Z`
Other Redo	`⌘ Cmd` + `↑ Shift` + `Z`
Other Redo	`⌘ Cmd` + `Y`
Other Show the settings menu	`⌘ Cmd` + `,`
Other Toggle comment	`⌘ Cmd` + `/`
Other Transpose letters	`Control` + `T`
Other Enter full screen	`⌘ Cmd` + `⤶ Enter`
Other Change to lower case	`Control` + `↑ Shift` + `U`
Other Change to upper case	`Control` + `U`
Other Overwrite	`Insert`
Other Macros replay	`⌘ Cmd` + `↑ Shift` + `E`
Other Center selection	`Control` + `L`