Undo is Ctrl-Z. Redo is either Ctrl-Y or in some programs Ctrl-Alt-Z.
ctrl + Z Ctrl +Z is undo for everything
Ctrl - 2009 Ctrl Z 1-3 was released on: USA: 14 July 2009
Try Ctrl + Y. There is no common universal shortcut for Redo, although you might find the option in some programs, e.g., Adobe Photoshop.
Ctrl + Z is Undo and Redo (last step only), Alt + Ctrl + Z is step backward and Shift + Ctrl + Z is step forward.
The cast of Ctrl-Z - 2012 includes: Kevin Nsabimana as Bully 1
Ctrl-Z - 2011 II was released on: USA: 27 July 2011
Ctrl + z.
Ctrl+Z mean EOF in WinDos, no matter what programming language you are using.
Ctrl Z.
Ctrl + Z = Undo
Chances are, Ctrl+Z