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 14.8.2.3 ‘:file’
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 The header argument ‘:file’ is used to specify an external file in which
 to save code block results.  After code block evaluation an Org mode
 style ‘[[file:]]’ link (see Link format) to the file will be
 inserted into the Org mode buffer.  Some languages including R, gnuplot,
 dot, and ditaa provide special handling of the ‘:file’ header argument
 automatically wrapping the code block body in the boilerplate code
 required to save output to the specified file.  This is often useful for
 saving graphical output of a code block to the specified file.
 
    The argument to ‘:file’ should be either a string specifying the path
 to a file, or a list of two strings in which case the first element of
 the list should be the path to a file and the second a description for
 the link.
 

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