Generate and install png icons from svg file

genicons.sh

#!/usr/bin/bash

src=$1
dst=${1%.*}.png

[[ -z "$2" ]] && type="apps" || type=$2

for i in 16 22 24 32 64 128
do
  inkscape -z -e $dst -w $i -h $i $src
  xdg-icon-resource install --context $type --size $i $dst
  rm $dst
done

why no 48x48?

You can add any size you want to the for loop. I updated it to include 48x48 for you, but add any more you think you'd need.

These are all the ones that currently exist on my machine: