npm install svgexport -g

svgexport <input file> <output file> <options>
svgexport <datafile>

<options>        [<format>] [<quality>] [<input viewbox>] [<output size>] [<resize mode>] [<styles>]

<format>         png|jpeg|jpg
                 If not specified, it will be inferred from output file extension or defaults to "png".

<quality>        1%-100%

<input viewbox>  <left>:<top>:<width>:<height>|<width>:<height>
                 If input viewbox is not specified it will be inferred from input file.

<output size>    <scale>x|<width>:<height>|<width>:|:<height>
                 If output size is specified as width:height, <viewbox mode> is used.

<viewbox mode>   crop|pad
                 Crop (slice) or pad (extend) input to match output aspect ratio, default mode is "crop".

<datafile>       Path of a JSON file with following content:
                 [ {
                   "input" : ["<input file>", "<option>", "<option>", ...],
                   "output": [ ["<output file>", "<option>", "<option>", ...] ]
                 }, ...]
                 Input file options are merged with and overridden by output file options.
                 Instead of a JSON file, a Node module which exports same content can be provided.

svgexport input.svg output.png 1.5x

svgexport input.svg output.png 32:

svgexport input.svg output.png  32:54

svgexport input.svg output.jpg 80%

#!/usr/bin/env ruby
# encoding: utf-8
dir = ARGV[0]

Dir.entries(dir).select { |f|
    f.end_with? '.svg'
}.each { |f|
    newFile = f.gsub '.svg', '.png'
    puts newFile
    system "cd #{dir} && svgexport #{f} #{newFile} 120:120"
}