Undo is a command in many computer programs. It erases the last change done to the document reverting it to an older state. In some more advanced programs such as graphic processing, undo will negate the last command done to the file being edited.

The opposite of undo is redo. The redo command reverses the undo or advances the buffer to a more current state.

In most Windows applications, the Undo command is activated by pressing the Ctrl+Z or Alt+Backspace keybindings. In virtually all Macintosh applications, the Undo command is activated by pressing Command-Z. The common command for Redo on Microsoft Windows systems is Ctrl+Y or Ctrl+Shift+Z. The common command for Redo on Apple Macintosh systems is Command-Shift-Z.

Read more about UndoHistory, Undo Models, Redo Models, Undo Implementation

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... The Ukrainian National Democratic Alliance, (UNDO) (Ukrainian ... UNDO was founded in 1925 and dissolved during the Soviet annexation of western Ukraine in 1939 ... Throughout the interwar years, UNDO enjoyed both German and Soviet financial support in their struggle against Poland ...
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... Popcorn" (Undo Records, 2003) "Hanging On" (Undo Records, 2007) "Ghost" (limited 7", Undo Records, 2008) "Breakthrough" (Undo Records, 2009) "Summer" (Out of ...
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... can be used to implement Multi-level Undo ... This can be used for state reversal needed in some undo implementations ...
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... The Undo Guy acts as a standard undo button, undoing the last change made to the image ... When clicked, the Undo Guy yaps out phrases such as "Oh, no!", "Yikes!" "Uh-oh!", "Espara un minuto!", "No, no, no!", "Wait a minute!", "No way!", "I made a boo-bo ...

Famous quotes containing the word undo:

    But ‘twas from mine, he took desire,
    Enough to undo the amorous world.
    Aphra Behn (1640–1689)

    Let thy song be love. This love will undo us all.
    William Shakespeare (1564–1616)