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⌘ Command+Y usually does not have this meaning in the Apple Macintosh operating system, where ⇧ Shift+⌘ Command+Z often does it.
For Linux program, it usually does nothing or functions as redo. In many applications, redo is handled by ⇧ Shift+^ Control+Z.
In SAPgui this enters block select mode, allowing the user to select text from a fixed-width text output such as an ABAP report. The mouse cursor turns into a cross-hair and the user can drag it across some text in order to select it (text in reports is not selectable across vertical text lines in SAPGui).
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