a little bash script (need inkscape installed) for transform svg in png

svgtopng.sh

#!/bin/bash

# Default Parameters
pattern="*.svg"
output="./svgtopng-output"
x=false
width="128"
y=false
height="128"

function USAGE {
  echo "svgtopng :"
  echo "  dependencies :"
  echo "  - Inkscape (sudo apt-get install inkscape)"
  echo "  options :"
  echo '  - -p "pattern" : pattern of svg filename to filtered'
  echo "    default -p \"$pattern\""
  echo '  - -o "output" : path of output folder of exported png'
  echo "    default -o \"$output\""
  echo '  - -x "width" : width of png in px'
  echo "    default -x \"$width\""
  echo '  - -y "height" : height of png in px'
  echo "    default -y \"$height\""
  echo '  - -h : get help'
}

# parse args, thx http://wiki.bash-hackers.org/howto/getopts_tutorial
while getopts ":p:o:x:y:h" opt; do
  case $opt in
    p)
      pattern="$OPTARG"
      ;;
    o)
      output="$OPTARG"
      ;;
    x)
      width="$OPTARG"
      x=true
      ;;
    y)
      height="$OPTARG"
      y=true
      ;;
    h)
      USAGE
      exit 0
      ;;
    \?)
      USAGE
      exit 1
      ;;
    :)
      USAGE
      exit 1
      ;;
  esac
done

# determine if precised -x and -y or just one ore none
# craft command line will be called for each filtered file in process
cli='inkscape -z -e "$output/$png" -w $width -h $height "$f"'
if [ "$x" = true  -a "$y" = false ]; then
  cli='inkscape -z -e "$output/$png" -w $width "$f"'
elif [ "$x" = false  -a "$y" = true ]; then
  cli='inkscape -z -e "$output/$png" -h $height "$f"'
fi

# create output-dir
mkdir -p "$output"

# process
for f in $(find . -name "$pattern" -type f); do
  png=$(basename "$f" .svg).png
  eval $cli
done