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Control-Y
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<p>Control-Y is a common computer command. It is generated by holding Ctrl and pressing the Y key on most <a href="/facts/Computer_keyboard/MczF9LIS">computer keyboards</a>. </p><p>In most Windows applications this keyboard shortcut functions as <a href="/facts/Undo/ELQMGH4k">Redo</a>, reversing a previous Undo. In some programs such as <a href="/facts/Microsoft_Office/faD8vYG0">Microsoft Office</a> it repeats the previous action if it was something other than Undo. </p><p><a href="/facts/Apple_Macintosh/8GhnXTK0">Apple Macintosh</a> systems use ⌘ Command+⇧ Shift+Z for Redo. In general a shortcut on Macintosh using ⌘ Command matches up with a shortcut on Windows using Ctrl, this is one of the most noticeable conflicts. Many programs (on all systems including <a href="/facts/Linux/9FvCKSTq">Linux</a>) support <i>both</i> Ctrl+Y and Ctrl+⇧ Shift+Z for Redo to resolve this conflict. But quite a few remain where only one or the other shortcut works. </p>