To convert a single SVG file to PNG using Inkscape:

/Applications/Inkscape.app/Contents/MacOS/inkscape -w 100 -h 140 2C.svg -o 100x140/2C.png

To convert many SVG files:

for f in $(ls *.svg)
do
  /Applications/Inkscape.app/Contents/MacOS/inkscape -w 100 -h 140 $f -o 100x140/${f/svg/png}
done