^_Undo

`Ctrl` + `7`

All hotkeys for Bash (Linux)

Navigation Go to Beginning of Line	`Home` / `Ctrl` + `A`
Navigation Go to End of Line	`Ctrl` + `E` / `End`
Navigation Forward one character	`Ctrl` + `F`
Navigation Backward ine character	`Ctrl` + `B`
Navigation Toggle between start of line and cursor current position	`Ctrl` + `XX`
Navigation Previous Command	`Ctrl` + `P` / `Up Arrow`
Navigation Next Arrow	`Ctrl` + `N` / `Down Arrow`
Navigation Back one word	`Alt` + `B`
Navigation Forward one word	`Alt` + `F`
Editing Clear Screen	`Ctrl` + `L`
Editing Delete Character Under Cursor	`Ctrl` + `D`
Editing Delete Character From Left	`Ctrl` + `H`
Editing Delete Word before Cursor	`Alt` + `Del`
Editing Delete Word After Cursor	`Alt` + `D`
Editing Cut Word Before Cursor to Clipboard	`Ctrl` + `W`
Editing Cut Line After Cursor to Clipboard	`Ctrl` + `K`
Editing Cut Line Before Cursor to Clipboard	`Ctrl` + `U`
Editing Swap Current Word with Previous	`Alt` + `T`
Editing Swap Last Character before Cursor	`Ctrl` + `T`
Editing Swap Last Two Words Before Cursor	`Esc` + `T`
Editing Paste Last Thing to be Cut	`Ctrl` + `Y`
Editing Undo	`Ctrl` + `_`
Editing Upper Capitalize Every Character form Cursor	`Alt` + `U`
Editing Lower The Case Every Character Form Cursor	`Alt` + `L`
Editing Capitalize Character Under Cursor and Move to End of the Word	`Alt` + `C`
Editing Cancel Changes and Put Back the Line	`Alt` + `R`
Editing Tab	`Ctrl` + `I`
Editing NewLine	`Ctrl` + `J`
Editing Enter	`Ctrl` + `M`
Editing Escape	`Ctrl` + `[`
Control Character ^@	`Ctrl` + `2`
Control Character ^Escape	`Ctrl` + `3`
Control Character ^\	`Ctrl` + `4`
Control Character ^	`Ctrl` + `5`
Control Character ^^	`Ctrl` + `6`
Control Character ^_Undo	`Ctrl` + `7`
Control Character ^? Backward Delete Char	`Ctrl` + `8`
Control Character Display Sequence for Enter Key	`Ctrl` + `V`
History Recall Last Command	`Ctrl` + `R`
History Previous Command in History	`Ctrl` + `P`
History Next Command in History	`Ctrl` + `N`
History Go back to Next Most Recent Command	`Ctrl` + `S`
History Execute Command found via Ctrl+R/Ctrl+S	`Ctrl` + `O`
History Escape from History Searching Mode	`Ctrl` + `G`
History Repeat Last Command	`!!`
History Run Last Commnd Starting with abc	`!abc`
History Print last Command starting with abc	`!abc:p`
History Last Argument of Previous Command	`!$`
History Last Argument of Previous Command	`Alt` + `.`
History All Arguments of Previous Command	`!*`
History Run Previous Command,replacing abc with def	`^abc^def`
Process Controls Interrupt/Kill Whatever you are running	`Ctrl` + `C`
Process Controls Clear Screen	`Ctrl` + `L`
Process Controls Stop Output to Screen	`Ctrl` + `S`
Process Controls Allow Output to Screen	`Ctrl` + `Q`
Process Controls Send an EOF Marker	`Ctrl` + `D`
Process Controls Send the signal SIGTSTP to Current Task	`Ctrl` + `Z`
Emacs Mode/Vi Mode Set Vi Mode	`$set -o vi`
Emacs Mode/Vi Mode Set Emacs Mode	`$set -o emacs`