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How to write output to an external text file in addition to the standard output stream, i.e. a notebook for a session with FE and stdout for command-line session?

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I expected this to work but it apparently only writes Print output:

AppendTo[
  $Output, 
  OpenWrite["out.txt", FormatType -> OutputForm]
]

A workaround using $PrePrint:

output = OpenWrite["out.txt", FormatType -> OutputForm];

$PrePrint = (Write[output, #]; #) &;
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  • $\begingroup$ Is it possible to use PutAppend[] and not OpenWrite[]? $\endgroup$ – qazwsx Jun 20 '12 at 3:12
  • 1
    $\begingroup$ @MaThEmAtika how about OpenAppend? $\endgroup$ – Mr.Wizard Jun 20 '12 at 3:47

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