Control-Y
{{Short description|Computer command}}
Control-Y is a common computer command. It is generated by holding {{keypress|Ctrl}} and pressing the {{Keypress|Y}} key on most computer keyboards.
In most Windows applications this keyboard shortcut functions as Redo, reversing a previous Undo. In some programs such as Microsoft Office it repeats the previous action if it was something other than Undo.{{Cite web | url=https://support.office.com/en-US/article/keyboard-shortcuts-for-microsoft-word-9a2e0234-e682-49ff-a4aa-999f07b51bf3 |title = Keyboard shortcuts in Word}}
Apple Macintosh systems use {{key press|Command|Shift|Z}} for Redo.[https://developer.apple.com/library/mac/documentation/userexperience/conceptual/applehiguidelines/KeyboardShortcuts/KeyboardShortcuts.html Apple Shortcut Key Standards] In general a shortcut on Macintosh using {{key press|Command}} matches up with a shortcut on Windows using {{key press|Ctrl}}, this is one of the most noticeable conflicts. Many programs (on all systems including Linux) support both {{key press|Ctrl|Y}} and {{key press|Ctrl|Shift|Z}} for Redo to resolve this conflict. But quite a few remain where only one or the other shortcut works.
Other uses
The OpenVMS operating system command-line uses {{key press|Ctrl|Y}} as its "abort" character, stronger in effect than the ordinary Control-C "interrupt" character.
{{key press|Ctrl|Y}} deleted the current line in the WordStar word processor for CP/M and MS-DOS.{{cite book|title=WordStar Reference Card|date=June 1980|publisher=MicroPro|location=San Rafael, CA|url=https://archive.org/stream/bitsavers_microProWoJun80_734543/Wordstar_Reference_Card_Jun80#page/n0/mode/2up|via=archive.org}} In the 1980s, many text editors and word processors mimicked the WordStar command set, making {{key press|Ctrl|Y}} a common synonym for "delete line."
In Borland IDEs it also deletes the current line.
In emacs it does a paste action (known as "yank").[https://www.gnu.org/software/emacs/manual/html_node/emacs/Yanking.html Yanking - GNU Emacs Manual] Emacs uses {{key press|Ctrl|/}} for Undo and Redo.
In vi and vim it scrolls the display up one line.{{Cite web |title=vi(1p) - Linux manual page |url=https://man7.org/linux/man-pages/man1/vi.1p.html |url-status=live |archive-url=https://web.archive.org/web/20230718085523/https://man7.org/linux/man-pages/man1/vi.1p.html |archive-date=2023-07-18 |access-date=2023-09-09 |website=man7.org |at=Scroll Backward by Line |quote=[count]
In the pico and nano text editors this shortcut scrolls one page up.{{Cite web | url=http://www.itcs.umich.edu/itcsdocs/r1168/ |title = U-M Information and Technology Services}}{{cite web |url=http://staffwww.fullcoll.edu/sedwards/Nano/NanoKeyboardCommands.html |title=Nano Keyboard Commands |accessdate=2015-12-09 |url-status=dead |archiveurl=https://web.archive.org/web/20151127221745/http://staffwww.fullcoll.edu/sedwards/Nano/NanoKeyboardCommands.html |archivedate=2015-11-27 }}
In SAP GUI it enters block-select mode.{{citation needed|date=August 2013}}