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In addition to assigning to In, the Mathematica main loop assigns the input to InString before it is parsed as an expression. You can then retrieve InString[1] and parse the result with ToExpression, wrapping it in Defer to prevent it from evaluating immediately: In[5]:= ToExpression[InString[1], StandardForm, Defer] Out[5]= Round[SessionTime[]] You can ...


$Epilog := PutAppend[DateList[], DownValues[In], "log.log"] will do what you want. It assumes the log file exists and will append to it. You could also place the PutAppend in the file end.m, where $Epilog reads from upon exit.


The input is stored as a downvalue in the definition of In. If you've only typed a few expressions, run Definition@In which prints a list of all the values associated with the symbol In, and copy from the line In[1] := Round[SessionTime[]]. But if you've typed hundreds of expressions, or expressions whose plain-text representations are long (like ...


In an attempt to reproduce this issue, I began with $Version (* "10.1.0 for Microsoft Windows (64-bit) (March 24, 2015)" *) I then typed x(*y*) and deleted by hand the left asterisk, right asterisk, left parenthesis, and right parenthesis in turn. xy Next I began Edit>Undo until I reached x (y*) At that point, Undo was not grayed out, so the ...


If I use menu Edit > Un/Comment Selection (Windows: Alt+/) the operation can be reversed with the Undo command. This is faster anyway and prevents broken syntax and syntax highlighting that occurs when you remove half a comment marker. (I post this as an answer because I hope it is pragmatically just that.)


This is a little raw but something along the lines of this should work... stream = OpenWrite["C:\\Temp\\KitchenSink.math"]; $Pre = (Write[stream, #]; #) &; $Post = (Write[stream, #]; #) &; When finished... Clear[$Pre, $Post]

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