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    $\begingroup$ Seems to work pretty well! $\endgroup$ Commented Jul 27, 2012 at 4:05
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    $\begingroup$ It will change the result of evaluation in some special cases, for example when you evaluate an expression with Head Sequence or Unevaluated. Probably $PreRead would be more universal. $\endgroup$ Commented Jul 27, 2012 at 6:14
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    $\begingroup$ I don't like auto-save as it seems to inevitably result in the far more frustrating event of auto-saving just after an accidental deletion or other major incorrect change. By saving to a separate backup notebook you eliminate this. +1 $\endgroup$ Commented Jul 27, 2012 at 10:22
  • $\begingroup$ One of my fu-moves is Alt-/, which toggles comments. I save very frequently, and almost always modify code by copying it into a new cell and tweaking it there, commenting out the old version when necessary. An accident with the code being tweaked, then, is isolated to a copy, and I can always safely back up. This is a verbose style, and the final notebooks need a LOT of cleanup, but it's robust and easy on the fingers. $\endgroup$ Commented Jul 31, 2012 at 20:36
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    $\begingroup$ Learning here, Could someone please explain what this does in a little more detail? For example is $pre changed permanently until re-defined or cleared? or is this change only going to stay in effect until you restart mathematica? How does one go about implementing this? Do I just stick this code in a cell and evaluate? Does it have to say in the notebook or can I delete it? Is $pre similar to an environmental variable? Thanks in advance (I didn't think this would warrant a new question, if I'm wrong I could ask one) $\endgroup$ Commented Oct 20, 2014 at 14:04