Help for writing an external template !

Hi, I try to write an external template to copy a text data file (/home/david/Data.txt) from LyX document directory (/home/david/document.lyx) to temporary directory where LaTeX is use (/tmp/lyx_tmpdir.MT2673/lyx_tmpbuf2). I need it when i use PGFPlot in a command LaTeX box : \addplot[ultra

Help for writing an external template !

Hi, I try to write an external template to copy a text data file (/home/david/Data.txt) from LyX document directory (/home/david/document.lyx) to temporary directory where LaTeX is use (/tmp/lyx_tmpdir.MT2673/lyx_tmpbuf2). I need it when i use PGFPlot in a command LaTeX box : \addplot[ultra