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              "value": "'%logstart name' saves to file 'name' in 'backup' mode.  It saves your history up to that point and then continues logging."
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                          "value": "log also IPython's output. In this mode, all commands which     generate an Out[NN] prompt are recorded to the logfile, right after     their corresponding input line. The output lines are always     prepended with a '#[Out]# ' marker, so that the log remains valid     Python code."
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