If you've ever worked with a vector tool to design something to be carved with a CNC routing machine, you may have needed to convert the resulting SVG file into a DXF. In my workflow I often use Inkscape to generate my SVG graphic, but my CAD software is CamBam and it requires a DXF file.
Many people have tried to make the perfect Inkscape plugin for exporting DXF, there is Better DXF Export, Better Better DXF Export and Big Blue Saw's DXF Export. I've had the most luck with the last one, but it was still finicky and often broke when updating Inkscape or OSX. Not only that, but at the end of the Big Blue Saw page, Simon mentions that he doesn't even use the plugin most of the time, instead relying on a command line tool called pstoedit.
With that in mind I made a small shell script which will convert an SVG file to DXF, you can save the script and run it directly or add the functions to your startup script.
The script is available on github under the project svgToDxf.
If you choose to add the functions directly to your startup script, as I have, simply copy the functions here and paste them in your .bashrc file. Now all you need to do to convert an SVG file to DXF is use the command svgToDxf MyCoolDesign.svg and the output will be MyCoolDesign.dxf