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<TITLE>Magic-7.3 Command Reference</TITLE>
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<H2>undo</H2>
<HR>
Undo commands
<HR>
<H3>Shortcuts:</H3>
<BLOCKQUOTE>
Key macro <B>U</B> implements the command <B>undo</B>.
</BLOCKQUOTE>
<H3>Usage:</H3>
<BLOCKQUOTE>
<B>undo</B> [<B>print</B> [<I>count</I>]] <BR><BR>
<BLOCKQUOTE>
where <I>count</I> indicates a number of events to be undone
(default 1 event), and must be a nonzero positive integer.
</BLOCKQUOTE>
</BLOCKQUOTE>
<H3>Summary:</H3>
<BLOCKQUOTE>
The <B>undo</B> command reverses the effect of the last
executed command (command-line, script, or macro-invoked),
returning the layout to the state it was in prior to
execution of that command. <P>
Certain commands in <B>magic</B> disable the undo mechanism,
thus preventing the command from being undone. These include
layout reads and writes, CIF, GDS, and LEF/DEF reads and
writes.
The <B>print</B> option generates a stack trace of the top
<I>count</I> events in the undo stack, in excruciating
detail.
</BLOCKQUOTE>
<H3>Implementation Notes:</H3>
<BLOCKQUOTE>
<B>undo</B> is implemented as a built-in window command in <B>magic</B>.
</BLOCKQUOTE>
<H3>See Also:</H3>
<BLOCKQUOTE>
<A HREF=redo.html><B>redo</B></A> <BR>
</BLOCKQUOTE>
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<TD> <A HREF=commands.html>Return to command index</A>
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<P><I>Last updated:</I> October 15, 2004 at 5:55am <P>
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